tinyms.vision

This module is to support vision augmentations. transforms is a high performance image augmentation module which is developed with C++ OpenCV.

class tinyms.vision.ImageViewer(image, label=None)

ImageViewer is a class defined for visualizing the input image.

参数

• image (Union[PIL.Image, numpy.ndarray]) – image input.

• label (str, optional) – specifies the label of this image. Default: None.

引发

TypeError – When image input is not numpy.ndarray or PIL.Image.

draw(pred_res, labels)

Draw the predicting boxes on the picture and show the visualized picture.

参数

• pred_res (dict) – The predcition result from tinyms.serving.predict method.

• labels (list) – The labels should be input manually with a list of string. This argument is required for distinguishing the color from different classes.

注解

This function is only valid when being called in interactive environment, such like Jupyter notebook.

实际案例

>>> form PIL import Image
>>>
>>> img = Image.open('example.jpg')
>>> img_viewer = ImageViewer(img)
>>> labels = ['1', '2', '3']
>>> img_viewer.draw(pred_res, labels)

show()

Directly show the visualized picture.

注解

This function is only valid when being called in interactive environment, such like Jupyter notebook.

实际案例

>>> form PIL import Image
>>>
>>> img = Image.open('example.jpg')
>>> img_viewer = ImageViewer(img, label='cat')
>>> img_viewer.show()

class tinyms.vision.Inter

Interpolation Modes.

Possible enumeration values are: Inter.NEAREST, Inter.ANTIALIAS, Inter.LINEAR, Inter.BILINEAR, Inter.CUBIC, Inter.BICUBIC, Inter.AREA, Inter.PILCUBIC.

• Inter.NEAREST: means interpolation method is nearest-neighbor interpolation.

• Inter.ANTIALIAS: means the interpolation method is antialias interpolation.

• Inter.LINEAR: means interpolation method is bilinear interpolation, here is the same as Inter.BILINEAR.

• Inter.BILINEAR: means interpolation method is bilinear interpolation.

• Inter.CUBIC: means the interpolation method is bicubic interpolation, here is the same as Inter.BICUBIC.

• Inter.BICUBIC: means the interpolation method is bicubic interpolation.

• Inter.AREA: means interpolation method is pixel area interpolation.

• Inter.PILCUBIC: means interpolation method is bicubic interpolation like implemented in pillow, input should be in 3 channels format.

class tinyms.vision.Border

Padding Mode, Border Type.

Possible enumeration values are: Border.CONSTANT, Border.EDGE, Border.REFLECT, Border.SYMMETRIC.

• Border.CONSTANT: means it fills the border with constant values.

• Border.EDGE: means it pads with the last value on the edge.

• Border.REFLECT: means it reflects the values on the edge omitting the last value of edge.

• Border.SYMMETRIC: means it reflects the values on the edge repeating the last value of edge.

Note: This class derived from class str to support json serializable.

class tinyms.vision.ImageBatchFormat

Data Format of images after batch operation.

Possible enumeration values are: ImageBatchFormat.NHWC, ImageBatchFormat.NCHW.

• ImageBatchFormat.NHWC: in orders like, batch N, height H, width W, channels C to store the data.

• ImageBatchFormat.NCHW: in orders like, batch N, channels C, height H, width W to store the data.

tinyms.vision.ssd_bboxes_encode(boxes)

Labels anchors with ground truth inputs.

参数

boxes (numpy.ndarray) – Ground truth with shape [N, 5], for each row, it stores [ymin, xmin, ymax, xmax, cls].

返回

numpy.ndarray, location ground truth with shape [num_anchors, 4]. numpy.ndarray, class ground truth with shape [num_anchors, 1]. numpy.ndarray, number of positives in an image.

tinyms.vision.ssd_bboxes_filter(boxes, box_scores, image_shape)

Filter predict boxes with minimum score and nms threshold.

参数

• boxes (numpy.ndarray) – Ground truth with shape [N, 4], for each row, it stores [ymin, xmin, ymax, xmax].

• box_scores (numpy.ndarray) – Class scores with shape [N, 21].

• image_shape (tuple) – Shape of original image with the format [h, w].

返回

list[list[float]], ground truth with shape [N, 4], for each row, it stores [ymin, xmin, ymax, xmax]. list[list[float]], class scores with shape [N, 21]. list[list[int]], class label with shape [N, 21].

tinyms.vision.coco_eval(pred_data, anno_file)

Calculate mAP of predicted bboxes.

class tinyms.vision.MnistTransform(configs=None)

Mnist dataset transform class.

Inputs:

img (Union[numpy.ndarray, PIL.Image]): Image to be transformed in Mnist-style.

Outputs:

numpy.ndarray, transformed image.

实际案例

>>> from PIL import Image
>>> from tinyms.vision import MnistTransform
>>>
>>> mnist_transform = MnistTransform()
>>> img = Image.open('object_detection.jpg')
>>> img = mnist_transform(img)

apply_ds(mnist_ds, repeat_size=1, batch_size=32, num_parallel_workers=None)

Apply preprocess operation on MnistDataset instance.

参数

• mnist_ds (data.MnistDataset) – MnistDataset instance.

• repeat_size (int) – The repeat size of dataset. Default: 1.

• batch_size (int) – Batch size. Default: 32.

• num_parallel_workers (int) – The number of concurrent workers. Default: None.

返回

data.MnistDataset, the preprocessed MnistDataset instance.

实际案例

>>> from tinyms.vision import MnistTransform
>>>
>>> mnist_transform = MnistTransform()
>>> mnist_ds = mnist_transform.apply_ds(mnist_ds)

postprocess(input, strategy='TOP1_CLASS')

Apply postprocess operation for prediction result.

参数

• input (numpy.ndarray) – Prediction result.

• strategy (str) – Specifies the postprocess strategy. Default: TOP1_CLASS.

返回

str, the postprocess result.

class tinyms.vision.Cifar10Transform(configs=None)

Cifar10 dataset transform class.

Inputs:

img (Union[numpy.ndarray, PIL.Image]): Image to be transformed in Cifar10-style.

Outputs:

numpy.ndarray, Transformed image.

实际案例

>>> from PIL import Image
>>> from tinyms.vision import Cifar10Transform
>>>
>>> cifar10_transform = Cifar10Transform()
>>> img = Image.open('object_detection.jpg')
>>> img = cifar10_transform(img)

“””

apply_ds(cifar10_ds, repeat_size=1, batch_size=32, num_parallel_workers=None, is_training=True)

Apply preprocess operation on Cifar10Dataset instance.

参数

• cifar10_ds (data.Cifar10Dataset) – Cifar10Dataset instance.

• repeat_size (int) – The repeat size of dataset. Default: 1.

• batch_size (int) – Batch size. Default: 32.

• num_parallel_workers (int) – The number of concurrent workers. Default: None.

• is_training (bool) – Specifies if is in training step. Default: True.

返回

data.Cifar10Dataset, the preprocessed Cifar10Dataset instance.

实际案例

>>> from tinyms.vision import Cifar10Transform
>>>
>>> cifar10_transform = Cifar10Transform()
>>> cifar10_ds = cifar10_transform.apply_ds(cifar10_ds)

postprocess(input, strategy='TOP1_CLASS')

Apply postprocess operation for prediction result.

参数

• input (numpy.ndarray) – Prediction result.

• strategy (str) – Specifies the postprocess strategy. Default: TOP1_CLASS.

返回

str, the postprocess result.

class tinyms.vision.ImageFolderTransform(configs=None)

ImageFolder dataset transform class.

Inputs:

img (Union[numpy.ndarray, PIL.Image]): Image to be transformed in ImageFolder-style.

Outputs:

numpy.ndarray, transformed image.

实际案例

>>> from PIL import Image
>>> from tinyms.vision import ImageFolderTransform
>>>
>>> imagefolder_transform = ImageFolderTransform()
>>> img = Image.open('object_detection.jpg')
>>> img = imagefolder_transform(img)

apply_ds(imagefolder_ds, repeat_size=1, batch_size=32, num_parallel_workers=None, is_training=True)

Apply preprocess operation on ImageFolderDataset instance.

参数

• cifar10_ds (data.ImageFolderDataset) – ImageFolderDataset instance.

• repeat_size (int) – The repeat size of dataset. Default: 1.

• batch_size (int) – Batch size. Default: 32.

• num_parallel_workers (int) – The number of concurrent workers. Default: None.

• is_training (bool) – Specifies if is in training step. Default: True.

返回

data.ImageFolderDataset, the preprocessed ImageFolderDataset instance.

实际案例

>>> from tinyms.vision import ImageFolderTransform
>>>
>>> imagefolder_transform = ImageFolderTransform()
>>> imagefolder_ds = imagefolder_transform.apply_ds(imagefolder_ds)

postprocess(input, strategy='TOP1_CLASS')

Apply postprocess operation for prediction result.

参数

• input (numpy.ndarray) – Prediction result.

• strategy (str) – Specifies the postprocess strategy. Default: TOP1_CLASS.

返回

str, the postprocess result.

class tinyms.vision.VOCTransform(configs=None)

VOC dataset transform class.

Inputs:

img (Union[numpy.ndarray, PIL.Image]): Image to be transformed in VOC-style.

Outputs:

numpy.ndarray, transformed image.

实际案例

>>> from PIL import Image
>>> from tinyms.vision import VOCTransform
>>>
>>> voc_transform = VOCTransform()
>>> img = Image.open('object_detection.jpg')
>>> img = voc_transform(img)

apply_ds(voc_ds, repeat_size=1, batch_size=32, num_parallel_workers=None, is_training=True)

Apply preprocess operation on VOCDataset instance.

参数

• voc_ds (data.VOCDataset) – VOCDataset instance.

• repeat_size (int) – The repeat size of dataset. Default: 1.

• batch_size (int) – Batch size. Default: 32.

• num_parallel_workers (int) – The number of concurrent workers. Default: None.

• is_training (bool) – Specifies if is in training step. Default: True.

返回

data.VOCDataset, the preprocessed VOCDataset instance.

实际案例

>>> from tinyms.vision import VOCTransform
>>>
>>> VOC_transform = VOCTransform()
>>> voc_ds = voc_transform.apply_ds(voc_ds)

postprocess(input, image_shape, strategy='TOP1_CLASS')

Apply postprocess operation for prediction result.

参数

• input (numpy.ndarray) – Prediction result.

• image_shape (tuple) – Image shape.

• strategy (str) – Specifies the postprocess strategy. Default: TOP1_CLASS.

返回

dict, the postprocess result.

class tinyms.vision.ShanshuiTransform(configs=None)

Shanshui dataset transform class.

Inputs:

img (Union[numpy.ndarray, PIL.Image]): Image to be transformed in VOC-style.

Outputs:

numpy.ndarray, transformed image.

实际案例

>>> from PIL import Image
>>> from tinyms.vision import ShanshuiTransform
>>>
>>> shanshui_transform = ShanshuiTransform()
>>> img = Image.open('object_detection.jpg')
>>> img = shanshui_transform(img)

apply_ds(voc_ds, repeat_size=1, batch_size=32, num_parallel_workers=None, is_training=True)

Apply preprocess operation on VOCDataset instance.

参数

• voc_ds (data.VOCDataset) – VOCDataset instance.

• repeat_size (int) – The repeat size of dataset. Default: 1.

• batch_size (int) – Batch size. Default: 32.

• num_parallel_workers (int) – The number of concurrent workers. Default: None.

• is_training (bool) – Specifies if is in training step. Default: True.

返回

data.VOCDataset, the preprocessed VOCDataset instance.

实际案例

>>> from tinyms.vision import VOCTransform
>>>
>>> VOC_transform = VOCTransform()
>>> voc_ds = voc_transform.apply_ds(voc_ds)

postprocess(input, image_shape, strategy='TOP1_CLASS')

Apply postprocess operation for prediction result.

参数

• input (numpy.ndarray) – Prediction result.

• image_shape (tuple) – Image shape.

• strategy (str) – Specifies the postprocess strategy. Default: TOP1_CLASS.

返回

dict, the postprocess result.

class tinyms.vision.CycleGanDatasetTransform(configs=None)

CycleGan dataset transform class.

Inputs:

img (Union[numpy.ndarray, PIL.Image]): Image to be transformed in city_scape.

Outputs:

numpy.ndarray, transformed image.

实际案例

>>> from PIL import Image
>>> from tinyms.vision import CycleGanDatasetTransform
>>>
>>> cyclegan_transform = CycleGanDatasetTransform()
>>> img = Image.open('object_detection.jpg')
>>> img = cyclegan_transform(img)

apply_ds(gan_generator_ds, repeat_size=1, batch_size=1, num_parallel_workers=1, shuffle=True, phase='train')

Apply preprocess operation on GeneratorDataset instance.

参数

• gan_generator_ds (data.GeneratorDataset) – GeneratorDataset instance.

• repeat_size (int) – The repeat size of dataset. Default: 1.

• batch_size (int) – Batch size. Default: 32.

• num_parallel_workers (int) – The number of concurrent workers. Default: 1.

• shuffle (bool) – Specifies if applying shuffle operation. Default: True.

• phase (str) – Specifies the current phase. Default: train.

返回

data.GeneratorDataset, the preprocessed GeneratorDataset instance.

实际案例

>>> from tinyms.vision import CycleGanDatasetTransform
>>>
>>> cyclegan_transform = CycleGanDatasetTransform()
>>> gan_generator_ds = cyclegan_transform.apply_ds(gan_generator_ds)

引发

TypeError – If gan_generator_ds is not instance of GeneratorDataset.

class tinyms.vision.AutoContrast(cutoff=0.0, ignore=None)

Apply automatic contrast on input image. This operator calculates histogram of image, reassign cutoff percent of lightest pixels from histogram to 255, and reassign cutoff percent of darkest pixels from histogram to 0.

参数

• cutoff (float, optional) – Percent of lightest and darkest pixels to cut off from the histogram of input image. the value must be in the range [0.0, 50.0) (default=0.0).

• ignore (Union[int, sequence], optional) – The background pixel values to ignore (default=None).

实际案例

>>> transforms_list = [c_vision.Decode(), c_vision.AutoContrast(cutoff=10.0, ignore=[10, 20])]
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
...                                                 input_columns=["image"])

class tinyms.vision.BoundingBoxAugment(transform, ratio=0.3)

Apply a given image transform on a random selection of bounding box regions of a given image.

参数

• transform – C++ transformation operator to be applied on random selection of bounding box regions of a given image.

• ratio (float, optional) – Ratio of bounding boxes to apply augmentation on. Range: [0, 1] (default=0.3).

实际案例

>>> # set bounding box operation with ratio of 1 to apply rotation on all bounding boxes
>>> bbox_aug_op = c_vision.BoundingBoxAugment(c_vision.RandomRotation(90), 1)
>>> # map to apply ops
>>> image_folder_dataset = image_folder_dataset.map(operations=[bbox_aug_op],
...                                                 input_columns=["image", "bbox"],
...                                                 output_columns=["image", "bbox"],
...                                                 column_order=["image", "bbox"])

class tinyms.vision.CenterCrop(size)

Crop the input image at the center to the given size. If input image size is smaller than output size, input image will be padded with 0 before cropping.

参数

size (Union[int, sequence]) – The output size of the cropped image. If size is an integer, a square crop of size (size, size) is returned. If size is a sequence of length 2, it should be (height, width).

实际案例

>>> # crop image to a square
>>> transforms_list1 = [c_vision.Decode(), c_vision.CenterCrop(50)]
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list1,
...                                                 input_columns=["image"])
>>> # crop image to portrait style
>>> transforms_list2 = [c_vision.Decode(), c_vision.CenterCrop((60, 40))]
>>> image_folder_dataset_1 = image_folder_dataset_1.map(operations=transforms_list2,
...                                                     input_columns=["image"])

class tinyms.vision.CutMixBatch(image_batch_format, alpha=1.0, prob=1.0)

Apply CutMix transformation on input batch of images and labels. Note that you need to make labels into one-hot format and batched before calling this operator.

参数

• image_batch_format (Image Batch Format) – The method of padding. Can be any of [ImageBatchFormat.NHWC, ImageBatchFormat.NCHW].

• alpha (float, optional) – hyperparameter of beta distribution (default = 1.0).

• prob (float, optional) – The probability by which CutMix is applied to each image (default = 1.0).

实际案例

>>> from mindspore.dataset.vision import ImageBatchFormat
>>> onehot_op = c_transforms.OneHot(num_classes=10)
>>> image_folder_dataset= image_folder_dataset.map(operations=onehot_op,
...                                                input_columns=["label"])
>>> cutmix_batch_op = c_vision.CutMixBatch(ImageBatchFormat.NHWC, 1.0, 0.5)
>>> image_folder_dataset = image_folder_dataset.batch(5)
>>> image_folder_dataset = image_folder_dataset.map(operations=cutmix_batch_op,
...                                                 input_columns=["image", "label"])

class tinyms.vision.CutOut(length, num_patches=1)

Randomly cut (mask) out a given number of square patches from the input image array.

参数

• length (int) – The side length of each square patch.

• num_patches (int, optional) – Number of patches to be cut out of an image (default=1).

实际案例

>>> transforms_list = [c_vision.Decode(), c_vision.CutOut(80, num_patches=10)]
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
...                                                 input_columns=["image"])

class tinyms.vision.Decode(rgb=True)

Decode the input image in RGB mode(default) or BGR mode(deprecated).

参数

rgb (bool, optional) – Mode of decoding input image (default=True). If True means format of decoded image is RGB else BGR(deprecated).

实际案例

>>> transforms_list = [c_vision.Decode(), c_vision.RandomHorizontalFlip()]
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
...                                                 input_columns=["image"])

class tinyms.vision.Equalize

Apply histogram equalization on input image.

实际案例

>>> transforms_list = [c_vision.Decode(), c_vision.Equalize()]
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
...                                                 input_columns=["image"])

class tinyms.vision.Grayscale(num_output_channels=1)

Convert the input PIL Image to grayscale.

参数

num_output_channels (int) – Number of channels of the output grayscale image, which can be 1 or 3 (default=1). If num_output_channels is 3, the returned image will have 3 identical RGB channels.

实际案例

>>> from mindspore.dataset.transforms.py_transforms import Compose
>>> transforms_list = Compose([py_vision.Decode(),
...                            py_vision.Grayscale(3),
...                            py_vision.ToTensor()])
>>> # apply the transform to dataset through map function
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
...                                                 input_columns="image")

classmethod from_json(json_string)

Base from_json for Python tensor operations class

to_json()

Base to_json for Python tensor operations class

class tinyms.vision.HWC2CHW

Transpose the input image from shape (H, W, C) to shape (C, H, W). The input image should be 3 channels image.

实际案例

>>> transforms_list = [c_vision.Decode(),
...                    c_vision.RandomHorizontalFlip(0.75),
...                    c_vision.RandomCrop(512),
...                    c_vision.HWC2CHW()]
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
...                                                 input_columns=["image"])

class tinyms.vision.Invert

Apply invert on input image in RGB mode. This operator will reassign every pixel to (255 - pixel).

实际案例

>>> transforms_list = [c_vision.Decode(), c_vision.Invert()]
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
...                                                 input_columns=["image"])

class tinyms.vision.MixUpBatch(alpha=1.0)

Apply MixUp transformation on input batch of images and labels. Each image is multiplied by a random weight (lambda) and then added to a randomly selected image from the batch multiplied by (1 - lambda). The same formula is also applied to the one-hot labels. The lambda is generated based on the specified alpha value. Two coefficients x1, x2 are randomly generated in the range [alpha, 1], and lambda = (x1 / (x1 + x2)). Note that you need to make labels into one-hot format and batched before calling this operator.

参数

alpha (float, optional) – Hyperparameter of beta distribution (default = 1.0).

实际案例

>>> onehot_op = c_transforms.OneHot(num_classes=10)
>>> image_folder_dataset= image_folder_dataset.map(operations=onehot_op,
...                                                input_columns=["label"])
>>> mixup_batch_op = c_vision.MixUpBatch(alpha=0.9)
>>> image_folder_dataset = image_folder_dataset.batch(5)
>>> image_folder_dataset = image_folder_dataset.map(operations=mixup_batch_op,
...                                                 input_columns=["image", "label"])

class tinyms.vision.Normalize(mean, std)

Normalize the input image with respect to mean and standard deviation. This operator will normalize the input image with: output[channel] = (input[channel] - mean[channel]) / std[channel], where channel >= 1.

参数

• mean (sequence) – List or tuple of mean values for each channel, with respect to channel order. The mean values must be in range [0.0, 255.0].

• std (sequence) – List or tuple of standard deviations for each channel, with respect to channel order. The standard deviation values must be in range (0.0, 255.0].

实际案例

>>> decode_op = c_vision.Decode()
>>> normalize_op = c_vision.Normalize(mean=[121.0, 115.0, 100.0], std=[70.0, 68.0, 71.0])
>>> transforms_list = [decode_op, normalize_op]
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
...                                                 input_columns=["image"])

class tinyms.vision.Pad(padding, fill_value=0, padding_mode=<Border.CONSTANT: 'constant'>)

Pad the image according to padding parameters.

参数

• padding (Union[int, sequence]) – The number of pixels to pad the image. If a single number is provided, it pads all borders with this value. If a tuple or lists of 2 values are provided, it pads the (left and top) with the first value and (right and bottom) with the second value. If 4 values are provided as a list or tuple, it pads the left, top, right and bottom respectively.

• fill_value (Union[int, tuple], optional) – The pixel intensity of the borders, only valid for padding_mode Border.CONSTANT. If it is a 3-tuple, it is used to fill R, G, B channels respectively. If it is an integer, it is used for all RGB channels. The fill_value values must be in range [0, 255] (default=0).

• padding_mode (Border mode, optional) –

  The method of padding (default=Border.CONSTANT). Can be any of [Border.CONSTANT, Border.EDGE, Border.REFLECT, Border.SYMMETRIC].

  • Border.CONSTANT, means it fills the border with constant values.

  • Border.EDGE, means it pads with the last value on the edge.

  • Border.REFLECT, means it reflects the values on the edge omitting the last value of edge.

  • Border.SYMMETRIC, means it reflects the values on the edge repeating the last value of edge.

实际案例

>>> transforms_list = [c_vision.Decode(), c_vision.Pad([100, 100, 100, 100])]
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
...                                                 input_columns=["image"])

tinyms.vision.PILRandomHorizontalFlip

mindspore.dataset.vision.py_transforms.RandomHorizontalFlip 的别名

class tinyms.vision.RandomAffine(degrees, translate=None, scale=None, shear=None, resample=<Inter.NEAREST: 0>, fill_value=0)

Apply Random affine transformation to the input image.

参数

• degrees (int or float or sequence) – Range of the rotation degrees. If degrees is a number, the range will be (-degrees, degrees). If degrees is a sequence, it should be (min, max).

• translate (sequence, optional) – Sequence (tx_min, tx_max, ty_min, ty_max) of minimum/maximum translation in x(horizontal) and y(vertical) directions (default=None). The horizontal and vertical shift is selected randomly from the range: (tx_min*width, tx_max*width) and (ty_min*height, ty_max*height), respectively. If a tuple or list of size 2, then a translate parallel to the X axis in the range of (translate[0], translate[1]) is applied. If a tuple of list of size 4, then a translate parallel to the X axis in the range of (translate[0], translate[1]) and a translate parallel to the Y axis in the range of (translate[2], translate[3]) are applied. If None, no translation is applied.

• scale (sequence, optional) – Scaling factor interval (default=None, original scale is used).

• shear (int or float or sequence, optional) – Range of shear factor (default=None). If a number, then a shear parallel to the X axis in the range of (-shear, +shear) is applied. If a tuple or list of size 2, then a shear parallel to the X axis in the range of (shear[0], shear[1]) is applied. If a tuple of list of size 4, then a shear parallel to X axis in the range of (shear[0], shear[1]) and a shear parallel to Y axis in the range of (shear[2], shear[3]) is applied. If None, no shear is applied.

• resample (Inter mode, optional) –

  An optional resampling filter (default=Inter.NEAREST). It can be any of [Inter.BILINEAR, Inter.NEAREST, Inter.BICUBIC].

  • Inter.BILINEAR, means resample method is bilinear interpolation.

  • Inter.NEAREST, means resample method is nearest-neighbor interpolation.

  • Inter.BICUBIC, means resample method is bicubic interpolation.

• fill_value (tuple or int, optional) – Optional fill_value to fill the area outside the transform in the output image. There must be three elements in tuple and the value of single element is [0, 255]. (default=0, filling is performed).

引发

• ValueError – If degrees is negative.

• ValueError – If translation value is not between -1 and 1.

• ValueError – If scale is not positive.

• ValueError – If shear is a number but is not positive.

• TypeError – If degrees is not a number or a list or a tuple. If degrees is a list or tuple, its length is not 2.

• TypeError – If translate is specified but is not list or a tuple of length 2 or 4.

• TypeError – If scale is not a list or tuple of length 2.

• TypeError – If shear is not a list or tuple of length 2 or 4.

• TypeError – If fill_value is not a single integer or a 3-tuple.

实际案例

>>> from mindspore.dataset.vision import Inter
>>> decode_op = c_vision.Decode()
>>> random_affine_op = c_vision.RandomAffine(degrees=15,
...                                          translate=(-0.1, 0.1, 0, 0),
...                                          scale=(0.9, 1.1),
...                                          resample=Inter.NEAREST)
>>> transforms_list = [decode_op, random_affine_op]
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
...                                                 input_columns=["image"])

class tinyms.vision.RandomColor(degrees=(0.1, 1.9))

Adjust the color of the input image by a fixed or random degree. This operation works only with 3-channel color images.

参数

degrees (sequence, optional) – Range of random color adjustment degrees. It should be in (min, max) format. If min=max, then it is a single fixed magnitude operation (default=(0.1, 1.9)).

实际案例

>>> transforms_list = [c_vision.Decode(), c_vision.RandomColor((0.5, 2.0))]
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
...                                                 input_columns=["image"])

class tinyms.vision.RandomColorAdjust(brightness=(1, 1), contrast=(1, 1), saturation=(1, 1), hue=(0, 0))

Randomly adjust the brightness, contrast, saturation, and hue of the input image.

参数

• brightness (Union[float, list, tuple], optional) – Brightness adjustment factor (default=(1, 1)). Cannot be negative. If it is a float, the factor is uniformly chosen from the range [max(0, 1-brightness), 1+brightness]. If it is a sequence, it should be [min, max] for the range.

• contrast (Union[float, list, tuple], optional) – Contrast adjustment factor (default=(1, 1)). Cannot be negative. If it is a float, the factor is uniformly chosen from the range [max(0, 1-contrast), 1+contrast]. If it is a sequence, it should be [min, max] for the range.

• saturation (Union[float, list, tuple], optional) – Saturation adjustment factor (default=(1, 1)). Cannot be negative. If it is a float, the factor is uniformly chosen from the range [max(0, 1-saturation), 1+saturation]. If it is a sequence, it should be [min, max] for the range.

• hue (Union[float, list, tuple], optional) – Hue adjustment factor (default=(0, 0)). If it is a float, the range will be [-hue, hue]. Value should be 0 <= hue <= 0.5. If it is a sequence, it should be [min, max] where -0.5 <= min <= max <= 0.5.

实际案例

>>> decode_op = c_vision.Decode()
>>> transform_op = c_vision.RandomColorAdjust(brightness=(0.5, 1),
...                                           contrast=(0.4, 1),
...                                           saturation=(0.3, 1))
>>> transforms_list = [decode_op, transform_op]
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
...                                                 input_columns=["image"])

class tinyms.vision.RandomCrop(size, padding=None, pad_if_needed=False, fill_value=0, padding_mode=<Border.CONSTANT: 'constant'>)

Crop the input image at a random location. If input image size is smaller than output size, input image will be padded before cropping.

注解

If the input image is more than one, then make sure that the image size is the same.

参数

• size (Union[int, sequence]) – The output size of the cropped image. If size is an integer, a square crop of size (size, size) is returned. If size is a sequence of length 2, it should be (height, width).

• padding (Union[int, sequence], optional) – The number of pixels to pad the image (default=None). If padding is not None, pad image first with padding values. If a single number is provided, pad all borders with this value. If a tuple or lists of 2 values are provided, pad the (left and top) with the first value and (right and bottom) with the second value. If 4 values are provided as a list or tuple, pad the left, top, right and bottom respectively.

• pad_if_needed (bool, optional) – Pad the image if either side is smaller than the given output size (default=False).

• fill_value (Union[int, tuple], optional) – The pixel intensity of the borders, only valid for padding_mode Border.CONSTANT. If it is a 3-tuple, it is used to fill R, G, B channels respectively. If it is an integer, it is used for all RGB channels. The fill_value values must be in range [0, 255] (default=0).

• padding_mode (Border mode, optional) –

  The method of padding (default=Border.CONSTANT). It can be any of [Border.CONSTANT, Border.EDGE, Border.REFLECT, Border.SYMMETRIC].

  • Border.CONSTANT, means it fills the border with constant values.

  • Border.EDGE, means it pads with the last value on the edge.

  • Border.REFLECT, means it reflects the values on the edge omitting the last value of edge.

  • Border.SYMMETRIC, means it reflects the values on the edge repeating the last value of edge.

实际案例

>>> from mindspore.dataset.vision import Border
>>> decode_op = c_vision.Decode()
>>> random_crop_op = c_vision.RandomCrop(512, [200, 200, 200, 200], padding_mode=Border.EDGE)
>>> transforms_list = [decode_op, random_crop_op]
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
...                                                 input_columns=["image"])

class tinyms.vision.RandomCropDecodeResize(size, scale=(0.08, 1.0), ratio=(0.75, 1.3333333333333333), interpolation=<Inter.BILINEAR: 2>, max_attempts=10)

A combination of Crop, Decode and Resize. It will get better performance for JPEG images. This operator will crop the input image at a random location, decode the cropped image in RGB mode, and resize the decoded image.

参数

• size (Union[int, sequence]) – The output size of the resized image. If size is an integer, a square crop of size (size, size) is returned. If size is a sequence of length 2, it should be (height, width).

• scale (list, tuple, optional) – Range [min, max) of respective size of the original size to be cropped (default=(0.08, 1.0)).

• ratio (list, tuple, optional) – Range [min, max) of aspect ratio to be cropped (default=(3. / 4., 4. / 3.)).

• interpolation (Inter mode, optional) –

  Image interpolation mode for resize operator(default=Inter.BILINEAR). It can be any of [Inter.BILINEAR, Inter.NEAREST, Inter.BICUBIC].

  • Inter.BILINEAR, means interpolation method is bilinear interpolation.

  • Inter.NEAREST, means interpolation method is nearest-neighbor interpolation.

  • Inter.BICUBIC, means interpolation method is bicubic interpolation.

• max_attempts (int, optional) – The maximum number of attempts to propose a valid crop_area (default=10). If exceeded, fall back to use center_crop instead.

实际案例

>>> from mindspore.dataset.vision import Inter
>>> resize_crop_decode_op = c_vision.RandomCropDecodeResize(size=(50, 75),
...                                                         scale=(0.25, 0.5),
...                                                         interpolation=Inter.NEAREST,
...                                                         max_attempts=5)
>>> transforms_list = [resize_crop_decode_op]
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
...                                                 input_columns=["image"])

class tinyms.vision.RandomCropWithBBox(size, padding=None, pad_if_needed=False, fill_value=0, padding_mode=<Border.CONSTANT: 'constant'>)

Crop the input image at a random location and adjust bounding boxes accordingly.

参数

• size (Union[int, sequence]) – The output size of the cropped image. If size is an integer, a square crop of size (size, size) is returned. If size is a sequence of length 2, it should be (height, width).

• padding (Union[int, sequence], optional) – The number of pixels to pad the image (default=None). If padding is not None, first pad image with padding values. If a single number is provided, pad all borders with this value. If a tuple or lists of 2 values are provided, pad the (left and top) with the first value and (right and bottom) with the second value. If 4 values are provided as a list or tuple, pad the left, top, right and bottom respectively.

• pad_if_needed (bool, optional) – Pad the image if either side is smaller than the given output size (default=False).

• fill_value (Union[int, tuple], optional) – The pixel intensity of the borders, only valid for padding_mode Border.CONSTANT. If it is a 3-tuple, it is used to fill R, G, B channels respectively. If it is an integer, it is used for all RGB channels. The fill_value values must be in range [0, 255] (default=0).

• padding_mode (Border mode, optional) –

  The method of padding (default=Border.CONSTANT). It can be any of [Border.CONSTANT, Border.EDGE, Border.REFLECT, Border.SYMMETRIC].

  • Border.CONSTANT, means it fills the border with constant values.

  • Border.EDGE, means it pads with the last value on the edge.

  • Border.REFLECT, means it reflects the values on the edge omitting the last value of edge.

  • Border.SYMMETRIC, means it reflects the values on the edge repeating the last value of edge.

实际案例

>>> decode_op = c_vision.Decode()
>>> random_crop_with_bbox_op = c_vision.RandomCropWithBBox([512, 512], [200, 200, 200, 200])
>>> transforms_list = [decode_op, random_crop_with_bbox_op]
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
...                                                 input_columns=["image"])

class tinyms.vision.RandomHorizontalFlip(prob=0.5)

Randomly flip the input image horizontally with a given probability.

参数

prob (float, optional) – Probability of the image being flipped (default=0.5).

实际案例

>>> transforms_list = [c_vision.Decode(), c_vision.RandomHorizontalFlip(0.75)]
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
...                                                 input_columns=["image"])

class tinyms.vision.RandomHorizontalFlipWithBBox(prob=0.5)

Flip the input image horizontally randomly with a given probability and adjust bounding boxes accordingly.

参数

prob (float, optional) – Probability of the image being flipped (default=0.5).

实际案例

>>> transforms_list = [c_vision.Decode(), c_vision.RandomHorizontalFlipWithBBox(0.70)]
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
...                                                 input_columns=["image"])

class tinyms.vision.RandomPosterize(bits=(8, 8))

Reduce the number of bits for each color channel to posterize the input image randomly with a given probability.

参数

bits (sequence or int, optional) – Range of random posterize to compress image. Bits values must be in range of [1,8], and include at least one integer value in the given range. It must be in (min, max) or integer format. If min=max, then it is a single fixed magnitude operation (default=(8, 8)).

实际案例

>>> transforms_list = [c_vision.Decode(), c_vision.RandomPosterize((6, 8))]
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
...                                                 input_columns=["image"])

class tinyms.vision.RandomResize(size)

Resize the input image using a randomly selected interpolation mode.

参数

size (Union[int, sequence]) – The output size of the resized image. If size is an integer, smaller edge of the image will be resized to this value with the same image aspect ratio. If size is a sequence of length 2, it should be (height, width).

实际案例

>>> # randomly resize image, keeping aspect ratio
>>> transforms_list1 = [c_vision.Decode(), c_vision.RandomResize(50)]
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list1,
...                                                 input_columns=["image"])
>>> # randomly resize image to landscape style
>>> transforms_list2 = [c_vision.Decode(), c_vision.RandomResize((40, 60))]
>>> image_folder_dataset_1 = image_folder_dataset_1.map(operations=transforms_list2,
...                                                     input_columns=["image"])

class tinyms.vision.RandomResizedCrop(size, scale=(0.08, 1.0), ratio=(0.75, 1.3333333333333333), interpolation=<Inter.BILINEAR: 2>, max_attempts=10)

Crop the input image to a random size and aspect ratio. This operator will crop the input image randomly, and resize the cropped image using a selected interpolation mode.

注解

If the input image is more than one, then make sure that the image size is the same.

参数

• size (Union[int, sequence]) – The output size of the resized image. If size is an integer, a square crop of size (size, size) is returned. If size is a sequence of length 2, it should be (height, width).

• scale (list, tuple, optional) – Range [min, max) of respective size of the original size to be cropped (default=(0.08, 1.0)).

• ratio (list, tuple, optional) – Range [min, max) of aspect ratio to be cropped (default=(3. / 4., 4. / 3.)).

• interpolation (Inter mode, optional) –

  Image interpolation mode for resize operator (default=Inter.BILINEAR). It can be any of [Inter.BILINEAR, Inter.NEAREST, Inter.BICUBIC, Inter.PILCUBIC].

  • Inter.BILINEAR, means interpolation method is bilinear interpolation.

  • Inter.NEAREST, means interpolation method is nearest-neighbor interpolation.

  • Inter.BICUBIC, means interpolation method is bicubic interpolation.

  • Inter.AREA, means interpolation method is pixel area interpolation.

  • Inter.PILCUBIC, means interpolation method is bicubic interpolation like implemented in pillow, input should be in 3 channels format.

• max_attempts (int, optional) – The maximum number of attempts to propose a valid crop_area (default=10). If exceeded, fall back to use center_crop instead.

实际案例

>>> from mindspore.dataset.vision import Inter
>>> decode_op = c_vision.Decode()
>>> resize_crop_op = c_vision.RandomResizedCrop(size=(50, 75), scale=(0.25, 0.5),
...                                             interpolation=Inter.BILINEAR)
>>> transforms_list = [decode_op, resize_crop_op]
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
...                                                 input_columns=["image"])

class tinyms.vision.RandomResizedCropWithBBox(size, scale=(0.08, 1.0), ratio=(0.75, 1.3333333333333333), interpolation=<Inter.BILINEAR: 2>, max_attempts=10)

Crop the input image to a random size and aspect ratio and adjust bounding boxes accordingly.

参数

• size (Union[int, sequence]) – The size of the output image. If size is an integer, a square crop of size (size, size) is returned. If size is a sequence of length 2, it should be (height, width).

• scale (list, tuple, optional) – Range (min, max) of respective size of the original size to be cropped (default=(0.08, 1.0)).

• ratio (list, tuple, optional) – Range (min, max) of aspect ratio to be cropped (default=(3. / 4., 4. / 3.)).

• interpolation (Inter mode, optional) –

  Image interpolation mode (default=Inter.BILINEAR). It can be any of [Inter.BILINEAR, Inter.NEAREST, Inter.BICUBIC].

  • Inter.BILINEAR, means interpolation method is bilinear interpolation.

  • Inter.NEAREST, means interpolation method is nearest-neighbor interpolation.

  • Inter.BICUBIC, means interpolation method is bicubic interpolation.

• max_attempts (int, optional) – The maximum number of attempts to propose a valid crop area (default=10). If exceeded, fall back to use center crop instead.

实际案例

>>> from mindspore.dataset.vision import Inter
>>> decode_op = c_vision.Decode()
>>> bbox_op = c_vision.RandomResizedCropWithBBox(size=50, interpolation=Inter.NEAREST)
>>> transforms_list = [decode_op, bbox_op]
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
...                                                 input_columns=["image"])

class tinyms.vision.RandomResizeWithBBox(size)

Tensor operation to resize the input image using a randomly selected interpolation mode and adjust bounding boxes accordingly.

参数

size (Union[int, sequence]) – The output size of the resized image. If size is an integer, smaller edge of the image will be resized to this value with the same image aspect ratio. If size is a sequence of length 2, it should be (height, width).

实际案例

>>> # randomly resize image with bounding boxes, keeping aspect ratio
>>> transforms_list1 = [c_vision.Decode(), c_vision.RandomResizeWithBBox(60)]
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list1,
...                                                 input_columns=["image"])
>>> # randomly resize image with bounding boxes to portrait style
>>> transforms_list2 = [c_vision.Decode(), c_vision.RandomResizeWithBBox((80, 60))]
>>> image_folder_dataset_1 = image_folder_dataset_1.map(operations=transforms_list2,
...                                                     input_columns=["image"])

class tinyms.vision.RandomRotation(degrees, resample=<Inter.NEAREST: 0>, expand=False, center=None, fill_value=0)

Rotate the input image randomly within a specified range of degrees.

参数

• degrees (Union[int, float, sequence]) – Range of random rotation degrees. If degrees is a number, the range will be converted to (-degrees, degrees). If degrees is a sequence, it should be (min, max).

• resample (Inter mode, optional) –

  An optional resampling filter (default=Inter.NEAREST). It can be any of [Inter.BILINEAR, Inter.NEAREST, Inter.BICUBIC].

  • Inter.BILINEAR, means resample method is bilinear interpolation.

  • Inter.NEAREST, means resample method is nearest-neighbor interpolation.

  • Inter.BICUBIC, means resample method is bicubic interpolation.

• expand (bool, optional) – Optional expansion flag (default=False). If set to True, expand the output image to make it large enough to hold the entire rotated image. If set to False or omitted, make the output image the same size as the input. Note that the expand flag assumes rotation around the center and no translation.

• center (tuple, optional) – Optional center of rotation (a 2-tuple) (default=None). Origin is the top left corner. None sets to the center of the image.

• fill_value (Union[int, tuple], optional) – Optional fill color for the area outside the rotated image. If it is a 3-tuple, it is used to fill R, G, B channels respectively. If it is an integer, it is used for all RGB channels. The fill_value values must be in range [0, 255] (default=0).

实际案例

>>> from mindspore.dataset.vision import Inter
>>> transforms_list = [c_vision.Decode(),
...                    c_vision.RandomRotation(degrees=5.0,
...                    resample=Inter.NEAREST,
...                    expand=True)]
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
...                                                 input_columns=["image"])

class tinyms.vision.RandomSelectSubpolicy(policy)

Choose a random sub-policy from a policy list to be applied on the input image.

参数

policy (list(list(tuple(TensorOp, prob (float)))) – List of sub-policies to choose from. A sub-policy is a list of tuples (op, prob), where op is a TensorOp operation and prob is the probability that this op will be applied, and the prob values must be in range [0, 1]. Once a sub-policy is selected, each op within the sub-policy with be applied in sequence according to its probability.

实际案例

>>> policy = [[(c_vision.RandomRotation((45, 45)), 0.5),
...            (c_vision.RandomVerticalFlip(), 1),
...            (c_vision.RandomColorAdjust(), 0.8)],
...           [(c_vision.RandomRotation((90, 90)), 1),
...            (c_vision.RandomColorAdjust(), 0.2)]]
>>> image_folder_dataset = image_folder_dataset.map(operations=c_vision.RandomSelectSubpolicy(policy),
...                                                 input_columns=["image"])

class tinyms.vision.RandomSharpness(degrees=(0.1, 1.9))

Adjust the sharpness of the input image by a fixed or random degree. Degree of 0.0 gives a blurred image, degree of 1.0 gives the original image, and degree of 2.0 gives a sharpened image.

参数

degrees (Union[list, tuple], optional) – Range of random sharpness adjustment degrees. It should be in (min, max) format. If min=max, then it is a single fixed magnitude operation (default = (0.1, 1.9)).

引发

• TypeError – If degrees is not a list or tuple.

• ValueError – If degrees is negative.

• ValueError – If degrees is in (max, min) format instead of (min, max).

实际案例

>>> transforms_list = [c_vision.Decode(), c_vision.RandomSharpness(degrees=(0.2, 1.9))]
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
...                                                 input_columns=["image"])

class tinyms.vision.RandomSolarize(threshold=(0, 255))

Randomly selects a subrange within the specified threshold range and sets the pixel value within the subrange to (255 - pixel).

参数

threshold (tuple, optional) – Range of random solarize threshold (default=(0, 255)). Threshold values should always be in (min, max) format, where min and max are integers in the range (0, 255), and min <= max. If min=max, then invert all pixel values above min(max).

实际案例

>>> transforms_list = [c_vision.Decode(), c_vision.RandomSolarize(threshold=(10,100))]
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
...                                                 input_columns=["image"])

class tinyms.vision.RandomVerticalFlip(prob=0.5)

Randomly flip the input image vertically with a given probability.

参数

prob (float, optional) – Probability of the image being flipped (default=0.5).

实际案例

>>> transforms_list = [c_vision.Decode(), c_vision.RandomVerticalFlip(0.25)]
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
...                                                 input_columns=["image"])

class tinyms.vision.RandomVerticalFlipWithBBox(prob=0.5)

Flip the input image vertically, randomly with a given probability and adjust bounding boxes accordingly.

参数

prob (float, optional) – Probability of the image being flipped (default=0.5).

实际案例

>>> transforms_list = [c_vision.Decode(), c_vision.RandomVerticalFlipWithBBox(0.20)]
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
...                                                 input_columns=["image"])

class tinyms.vision.Rescale(rescale, shift)

Rescale the input image with the given rescale and shift. This operator will rescale the input image with: output = image * rescale + shift.

参数

• rescale (float) – Rescale factor.

• shift (float) – Shift factor.

实际案例

>>> transforms_list = [c_vision.Decode(), c_vision.Rescale(1.0 / 255.0, -1.0)]
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
...                                                 input_columns=["image"])

class tinyms.vision.Resize(size, interpolation=<Inter.BILINEAR: 2>)

Resize the input image to the given size with a given interpolation mode.

参数

• size (Union[int, sequence]) – The output size of the resized image. If size is an integer, the smaller edge of the image will be resized to this value with the same image aspect ratio. If size is a sequence of length 2, it should be (height, width).

• interpolation (Inter mode, optional) –

  Image interpolation mode (default=Inter.LINEAR). It can be any of [Inter.LINEAR, Inter.NEAREST, Inter.BICUBIC, Inter.PILCUBIC].

  • Inter.LINEAR, means interpolation method is bilinear interpolation.

  • Inter.NEAREST, means interpolation method is nearest-neighbor interpolation.

  • Inter.BICUBIC, means interpolation method is bicubic interpolation.

  • Inter.AREA, means interpolation method is pixel area interpolation.

  • Inter.PILCUBIC, means interpolation method is bicubic interpolation like implemented in pillow, input should be in 3 channels format.

实际案例

>>> from mindspore.dataset.vision import Inter
>>> decode_op = c_vision.Decode()
>>> resize_op = c_vision.Resize([100, 75], Inter.BICUBIC)
>>> transforms_list = [decode_op, resize_op]
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
...                                                 input_columns=["image"])

class tinyms.vision.ResizeWithBBox(size, interpolation=<Inter.BILINEAR: 2>)

Resize the input image to the given size and adjust bounding boxes accordingly.

参数

• size (Union[int, sequence]) – The output size of the resized image. If size is an integer, smaller edge of the image will be resized to this value with the same image aspect ratio. If size is a sequence of length 2, it should be (height, width).

• interpolation (Inter mode, optional) –

  Image interpolation mode (default=Inter.LINEAR). It can be any of [Inter.LINEAR, Inter.NEAREST, Inter.BICUBIC].

  • Inter.LINEAR, means interpolation method is bilinear interpolation.

  • Inter.NEAREST, means interpolation method is nearest-neighbor interpolation.

  • Inter.BICUBIC, means interpolation method is bicubic interpolation.

实际案例

>>> from mindspore.dataset.vision import Inter
>>> decode_op = c_vision.Decode()
>>> bbox_op = c_vision.ResizeWithBBox(50, Inter.NEAREST)
>>> transforms_list = [decode_op, bbox_op]
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
...                                                 input_columns=["image"])

class tinyms.vision.SoftDvppDecodeRandomCropResizeJpeg(size, scale=(0.08, 1.0), ratio=(0.75, 1.3333333333333333), max_attempts=10)

A combination of Crop, Decode and Resize using the simulation algorithm of Ascend series chip DVPP module.

The usage scenario is consistent with SoftDvppDecodeResizeJpeg. The input image size should be in range [32*32, 8192*8192]. The zoom-out and zoom-in multiples of the image length and width should in the range [1/32, 16]. Only images with an even resolution can be output. The output of odd resolution is not supported.

参数

• size (Union[int, sequence]) – The size of the output image. If size is an integer, a square crop of size (size, size) is returned. If size is a sequence of length 2, it should be (height, width).

• scale (list, tuple, optional) – Range [min, max) of respective size of the original size to be cropped (default=(0.08, 1.0)).

• ratio (list, tuple, optional) – Range [min, max) of aspect ratio to be cropped (default=(3. / 4., 4. / 3.)).

• max_attempts (int, optional) – The maximum number of attempts to propose a valid crop_area (default=10). If exceeded, fall back to use center_crop instead.

实际案例

>>> # decode, randomly crop and resize image, keeping aspect ratio
>>> transforms_list1 = [c_vision.SoftDvppDecodeRandomCropResizeJpeg(90)]
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list1,
...                                                 input_columns=["image"])
>>> # decode, randomly crop and resize to landscape style
>>> transforms_list2 = [c_vision.SoftDvppDecodeRandomCropResizeJpeg((80, 100))]
>>> image_folder_dataset_1 = image_folder_dataset_1.map(operations=transforms_list2,
...                                                     input_columns=["image"])

class tinyms.vision.SoftDvppDecodeResizeJpeg(size)

Decode and resize JPEG image using the simulation algorithm of Ascend series chip DVPP module.

It is recommended to use this algorithm in the following scenarios: When training, the DVPP of the Ascend chip is not used, and the DVPP of the Ascend chip is used during inference, and the accuracy of inference is lower than the accuracy of training; and the input image size should be in range [32*32, 8192*8192]. The zoom-out and zoom-in multiples of the image length and width should in the range [1/32, 16]. Only images with an even resolution can be output. The output of odd resolution is not supported.

参数

size (Union[int, sequence]) – The output size of the resized image. If size is an integer, smaller edge of the image will be resized to this value with the same image aspect ratio. If size is a sequence of length 2, it should be (height, width).

实际案例

>>> # decode and resize image, keeping aspect ratio
>>> transforms_list1 = [c_vision.SoftDvppDecodeResizeJpeg(70)]
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list1,
...                                                 input_columns=["image"])
>>> # decode and resize to portrait style
>>> transforms_list2 = [c_vision.SoftDvppDecodeResizeJpeg((80, 60))]
>>> image_folder_dataset_1 = image_folder_dataset_1.map(operations=transforms_list2,
...                                                     input_columns=["image"])

class tinyms.vision.UniformAugment(transforms, num_ops=2)

Perform randomly selected augmentation on input image.

参数

• transforms – List of C++ operations (Python operations are not accepted).

• num_ops (int, optional) – Number of operations to be selected and applied (default=2).

实际案例

>>> import mindspore.dataset.vision.py_transforms as py_vision
>>> transforms_list = [c_vision.RandomHorizontalFlip(),
...                    c_vision.RandomVerticalFlip(),
...                    c_vision.RandomColorAdjust(),
...                    c_vision.RandomRotation(degrees=45)]
>>> uni_aug_op = c_vision.UniformAugment(transforms=transforms_list, num_ops=2)
>>> transforms_all = [c_vision.Decode(), c_vision.Resize(size=[224, 224]),
...                   uni_aug_op]
>>> image_folder_dataset_1 = image_folder_dataset.map(operations=transforms_all,
...                                                   input_columns="image",
...                                                   num_parallel_workers=1)

class tinyms.vision.Compose(transforms)

Compose a list of transforms into a single transform.

参数

transforms (list) – List of transformations to be applied.

实际案例

>>> compose = c_transforms.Compose([c_vision.Decode(), c_vision.RandomCrop(512)])
>>> image_folder_dataset = image_folder_dataset.map(operations=compose)

class tinyms.vision.Concatenate(axis=0, prepend=None, append=None)

Tensor operation that concatenates all columns into a single tensor.

参数

• axis (int, optional) – Concatenate the tensors along given axis (Default=0).

• prepend (numpy.array, optional) – NumPy array to be prepended to the already concatenated tensors (Default=None).

• append (numpy.array, optional) – NumPy array to be appended to the already concatenated tensors (Default=None).

实际案例

>>> import numpy as np
>>> # concatenate string
>>> prepend_tensor = np.array(["dw", "df"], dtype='S')
>>> append_tensor = np.array(["dwsdf", "df"], dtype='S')
>>> concatenate_op = c_transforms.Concatenate(0, prepend_tensor, append_tensor)
>>> data = [["This","is","a","string"]]
>>> dataset = ds.NumpySlicesDataset(data)
>>> dataset = dataset.map(operations=concatenate_op)

class tinyms.vision.Duplicate

Duplicate the input tensor to output, only support transform one column each time.

实际案例

>>> # Data before
>>> # |  x      |
>>> # +---------+
>>> # | [1,2,3] |
>>> # +---------+
>>> data = [[1,2,3]]
>>> numpy_slices_dataset = ds.NumpySlicesDataset(data, ["x"])
>>> numpy_slices_dataset = numpy_slices_dataset.map(operations=c_transforms.Duplicate(),
...                                                 input_columns=["x"],
...                                                 output_columns=["x", "y"],
...                                                 column_order=["x", "y"])
>>> # Data after
>>> # |  x      |  y      |
>>> # +---------+---------+
>>> # | [1,2,3] | [1,2,3] |
>>> # +---------+---------+

class tinyms.vision.Fill(fill_value)

Tensor operation to fill all elements in the tensor with the specified value. The output tensor will have the same shape and type as the input tensor.

参数

fill_value (Union[str, bytes, int, float, bool]) – scalar value to fill the tensor with.

实际案例

>>> import numpy as np
>>> # generate a 1D integer numpy array from 0 to 4
>>> def generator_1d():
...     for i in range(5):
...         yield (np.array([i]),)
>>> generator_dataset = ds.GeneratorDataset(generator_1d, column_names="col1")
>>> # [[0], [1], [2], [3], [4]]
>>> fill_op = c_transforms.Fill(3)
>>> generator_dataset = generator_dataset.map(operations=fill_op)
>>> # [[3], [3], [3], [3], [3]]

class tinyms.vision.Mask(operator, constant, dtype=mindspore.bool_)

Mask content of the input tensor with the given predicate. Any element of the tensor that matches the predicate will be evaluated to True, otherwise False.

参数

• operator (Relational) – relational operators, it can be any of [Relational.EQ, Relational.NE, Relational.LT, Relational.GT, Relational.LE, Relational.GE], take Relational.EQ as example, EQ refers to equal.

• constant (Union[str, int, float, bool]) – Constant to be compared to. Constant will be cast to the type of the input tensor.

• dtype (mindspore.dtype, optional) – Type of the generated mask (Default mstype.bool_).

实际案例

>>> from mindspore.dataset.transforms.c_transforms import Relational
>>> # Data before
>>> # |  col   |
>>> # +---------+
>>> # | [1,2,3] |
>>> # +---------+
>>> data = [[1, 2, 3]]
>>> numpy_slices_dataset = ds.NumpySlicesDataset(data, ["col"])
>>> numpy_slices_dataset = numpy_slices_dataset.map(operations=c_transforms.Mask(Relational.EQ, 2))
>>> # Data after
>>> # |       col         |
>>> # +--------------------+
>>> # | [False,True,False] |
>>> # +--------------------+

class tinyms.vision.OneHot(num_classes)

Tensor operation to apply one hot encoding.

参数

num_classes (int) – Number of classes of objects in dataset. It should be larger than the largest label number in the dataset.

引发

RuntimeError – feature size is bigger than num_classes.

实际案例

>>> # Assume that dataset has 10 classes, thus the label ranges from 0 to 9
>>> onehot_op = c_transforms.OneHot(num_classes=10)
>>> mnist_dataset = mnist_dataset.map(operations=onehot_op, input_columns=["label"])

class tinyms.vision.PadEnd(pad_shape, pad_value=None)

Pad input tensor according to pad_shape, input tensor needs to have same rank.

参数

• pad_shape (list(int)) – List of integers representing the shape needed. Dimensions that set to None will not be padded (i.e., original dim will be used). Shorter dimensions will truncate the values.

• pad_value (Union[str, bytes, int, float, bool]), optional) – Value used to pad. Default to 0 or empty string in case of tensors of strings.

实际案例

>>> # Data before
>>> # |   col   |
>>> # +---------+
>>> # | [1,2,3] |
>>> # +---------|
>>> data = [[1, 2, 3]]
>>> numpy_slices_dataset = ds.NumpySlicesDataset(data, ["col"])
>>> numpy_slices_dataset = numpy_slices_dataset.map(operations=c_transforms.PadEnd(pad_shape=[4],
...                                                                                pad_value=10))
>>> # Data after
>>> # |    col     |
>>> # +------------+
>>> # | [1,2,3,10] |
>>> # +------------|

class tinyms.vision.RandomApply(transforms, prob=0.5)

Randomly perform a series of transforms with a given probability.

参数

• transforms (list) – List of transformations to be applied.

• prob (float, optional) – The probability to apply the transformation list (default=0.5).

实际案例

>>> rand_apply = c_transforms.RandomApply([c_vision.RandomCrop(512)])
>>> image_folder_dataset = image_folder_dataset.map(operations=rand_apply)

class tinyms.vision.RandomChoice(transforms)

Randomly select one transform from a list of transforms to perform operation.

参数

transforms (list) – List of transformations to be chosen from to apply.

实际案例

>>> rand_choice = c_transforms.RandomChoice([c_vision.CenterCrop(50), c_vision.RandomCrop(512)])
>>> image_folder_dataset = image_folder_dataset.map(operations=rand_choice)

class tinyms.vision.Slice(*slices)

Slice operation to extract a tensor out using the given n slices.

The functionality of Slice is similar to NumPy’s indexing feature (Currently only rank-1 tensors are supported).

参数

slices (Union[int, list[int], slice, None, Ellipsis]) –

Maximum n number of arguments to slice a tensor of rank n . One object in slices can be one of:

1. int: Slice this index only along the first dimension. Negative index is supported.

2. list(int): Slice these indices along the first dimension. Negative indices are supported.

3. slice: Slice the generated indices from the slice object along the first dimension. Similar to start:stop:step.

4. None: Slice the whole dimension. Similar to [:] in Python indexing.

5. Ellipsis: Slice the whole dimension, same result with None.

实际案例

>>> # Data before
>>> # |   col   |
>>> # +---------+
>>> # | [1,2,3] |
>>> # +---------|
>>> data = [[1, 2, 3]]
>>> numpy_slices_dataset = ds.NumpySlicesDataset(data, ["col"])
>>> # slice indices 1 and 2 only
>>> numpy_slices_dataset = numpy_slices_dataset.map(operations=c_transforms.Slice(slice(1,3)))
>>> # Data after
>>> # |   col   |
>>> # +---------+
>>> # |  [2,3]  |
>>> # +---------|

class tinyms.vision.TypeCast(data_type)

Tensor operation to cast to a given MindSpore data type.

参数

data_type (mindspore.dtype) – mindspore.dtype to be cast to.

实际案例

>>> import numpy as np
>>> from mindspore import dtype as mstype
>>>
>>> # Generate 1d int numpy array from 0 - 63
>>> def generator_1d():
...     for i in range(64):
...         yield (np.array([i]),)
>>>
>>> dataset = ds.GeneratorDataset(generator_1d, column_names='col')
>>> type_cast_op = c_transforms.TypeCast(mstype.int32)
>>> dataset = dataset.map(operations=type_cast_op)

class tinyms.vision.Unique

Perform the unique operation on the input tensor, only support transform one column each time.

Return 3 tensor: unique output tensor, index tensor, count tensor.

Unique output tensor contains all the unique elements of the input tensor in the same order that they occur in the input tensor.

Index tensor that contains the index of each element of the input tensor in the unique output tensor.

Count tensor that contains the count of each element of the output tensor in the input tensor.

注解

Call batch op before calling this function.

实际案例

>>> # Data before
>>> # |  x                 |
>>> # +--------------------+
>>> # | [[0,1,2], [1,2,3]] |
>>> # +--------------------+
>>> data = [[[0,1,2], [1,2,3]]]
>>> dataset = ds.NumpySlicesDataset(data, ["x"])
>>> dataset = dataset.map(operations=c_transforms.Unique(),
...                       input_columns=["x"],
...                       output_columns=["x", "y", "z"],
...                       column_order=["x", "y", "z"])
>>> # Data after
>>> # |  x      |  y              |z        |
>>> # +---------+-----------------+---------+
>>> # | [0,1,2,3] | [0,1,2,1,2,3] | [1,2,2,1]
>>> # +---------+-----------------+---------+