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- # Copyright 2021 Huawei Technologies Co., Ltd
- #
- # Licensed under the Apache License, Version 2.0 (the "License");
- # you may not use this file except in compliance with the License.
- # You may obtain a copy of the License at
- #
- # http://www.apache.org/licenses/LICENSE-2.0
- #
- # Unless required by applicable law or agreed to in writing, software
- # distributed under the License is distributed on an "AS IS" BASIS,
- # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- # See the License for the specific language governing permissions and
- # limitations under the License.
- # ============================================================================
- """autoaugment"""
- import random
- import numpy as np
- from PIL import Image, ImageEnhance, ImageOps
-
- class ImageNetPolicy:
- """ImageNetPolicy"""
- def __init__(self, fillcolor=(128, 128, 128)):
- self.policies = [
- SubPolicy(0.4, "posterize", 8, 0.6, "rotate", 9, fillcolor),
- SubPolicy(0.6, "solarize", 5, 0.6, "autocontrast", 5, fillcolor),
- SubPolicy(0.8, "equalize", 8, 0.6, "equalize", 3, fillcolor),
- SubPolicy(0.6, "posterize", 7, 0.6, "posterize", 6, fillcolor),
- SubPolicy(0.4, "equalize", 7, 0.2, "solarize", 4, fillcolor),
-
- SubPolicy(0.4, "equalize", 4, 0.8, "rotate", 8, fillcolor),
- SubPolicy(0.6, "solarize", 3, 0.6, "equalize", 7, fillcolor),
- SubPolicy(0.8, "posterize", 5, 1.0, "equalize", 2, fillcolor),
- SubPolicy(0.2, "rotate", 3, 0.6, "solarize", 8, fillcolor),
- SubPolicy(0.6, "equalize", 8, 0.4, "posterize", 6, fillcolor),
-
- SubPolicy(0.8, "rotate", 8, 0.4, "color", 0, fillcolor),
- SubPolicy(0.4, "rotate", 9, 0.6, "equalize", 2, fillcolor),
- SubPolicy(0.0, "equalize", 7, 0.8, "equalize", 8, fillcolor),
- SubPolicy(0.6, "invert", 4, 1.0, "equalize", 8, fillcolor),
- SubPolicy(0.6, "color", 4, 1.0, "contrast", 8, fillcolor),
-
- SubPolicy(0.8, "rotate", 8, 1.0, "color", 2, fillcolor),
- SubPolicy(0.8, "color", 8, 0.8, "solarize", 7, fillcolor),
- SubPolicy(0.4, "sharpness", 7, 0.6, "invert", 8, fillcolor),
- SubPolicy(0.6, "shearX", 5, 1.0, "equalize", 9, fillcolor),
- SubPolicy(0.4, "color", 0, 0.6, "equalize", 3, fillcolor),
-
- SubPolicy(0.4, "equalize", 7, 0.2, "solarize", 4, fillcolor),
- SubPolicy(0.6, "solarize", 5, 0.6, "autocontrast", 5, fillcolor),
- SubPolicy(0.6, "invert", 4, 1.0, "equalize", 8, fillcolor),
- SubPolicy(0.6, "color", 4, 1.0, "contrast", 8, fillcolor),
- SubPolicy(0.8, "equalize", 8, 0.6, "equalize", 3, fillcolor)
- ]
-
- def __call__(self, img):
- policy_idx = random.randint(0, len(self.policies) - 1)
- return self.policies[policy_idx](img)
-
- def __repr__(self):
- return "AutoAugment ImageNet Policy"
-
- #pylint: disable-msg=W0108
- class SubPolicy:
- """SubPolicy"""
- def __init__(self, p1, operation1, magnitude_idx1, p2, operation2, magnitude_idx2, fillcolor=(128, 128, 128)):
- ranges = {
- "shearX": np.linspace(0, 0.3, 10),
- "shearY": np.linspace(0, 0.3, 10),
- "translateX": np.linspace(0, 150 / 331, 10),
- "translateY": np.linspace(0, 150 / 331, 10),
- "rotate": np.linspace(0, 30, 10),
- "color": np.linspace(0.0, 0.9, 10),
- "posterize": np.round(np.linspace(8, 4, 10), 0).astype(np.int),
- "solarize": np.linspace(256, 0, 10),
- "contrast": np.linspace(0.0, 0.9, 10),
- "sharpness": np.linspace(0.0, 0.9, 10),
- "brightness": np.linspace(0.0, 0.9, 10),
- "autocontrast": [0] * 10,
- "equalize": [0] * 10,
- "invert": [0] * 10
- }
-
- def rotate_with_fill(img, magnitude):
- """rotate_with_fill"""
- rot = img.convert("RGBA").rotate(magnitude)
- return Image.composite(rot, Image.new("RGBA", rot.size, (128,) * 4), rot).convert(img.mode)
-
- func = {
- "shearX": lambda img, magnitude: img.transform(
- img.size, Image.AFFINE, (1, magnitude * random.choice([-1, 1]), 0, 0, 1, 0),
- Image.BICUBIC, fillcolor=fillcolor),
- "shearY": lambda img, magnitude: img.transform(
- img.size, Image.AFFINE, (1, 0, 0, magnitude * random.choice([-1, 1]), 1, 0),
- Image.BICUBIC, fillcolor=fillcolor),
- "translateX": lambda img, magnitude: img.transform(
- img.size, Image.AFFINE, (1, 0, magnitude * img.size[0] * random.choice([-1, 1]), 0, 1, 0),
- fillcolor=fillcolor),
- "translateY": lambda img, magnitude: img.transform(
- img.size, Image.AFFINE, (1, 0, 0, 0, 1, magnitude * img.size[1] * random.choice([-1, 1])),
- fillcolor=fillcolor),
- "rotate": lambda img, magnitude: rotate_with_fill(img, magnitude),
- # "rotate": lambda img, magnitude: img.rotate(magnitude * random.choice([-1, 1])),
- "color": lambda img, magnitude: ImageEnhance.Color(img).enhance(1 + magnitude * random.choice([-1, 1])),
- "posterize": lambda img, magnitude: ImageOps.posterize(img, magnitude),
- "solarize": lambda img, magnitude: ImageOps.solarize(img, magnitude),
- "contrast": lambda img, magnitude: ImageEnhance.Contrast(img).enhance(
- 1 + magnitude * random.choice([-1, 1])),
- "sharpness": lambda img, magnitude: ImageEnhance.Sharpness(img).enhance(
- 1 + magnitude * random.choice([-1, 1])),
- "brightness": lambda img, magnitude: ImageEnhance.Brightness(img).enhance(
- 1 + magnitude * random.choice([-1, 1])),
- "autocontrast": lambda img, _: ImageOps.autocontrast(img),
- "equalize": lambda img, _: ImageOps.equalize(img),
- "invert": lambda img, _: ImageOps.invert(img)
- }
-
- # self.name = "{}_{:.2f}_and_{}_{:.2f}".format(
- # operation1, ranges[operation1][magnitude_idx1],
- # operation2, ranges[operation2][magnitude_idx2])
- self.p1 = p1
- self.operation1 = func[operation1]
- self.magnitude1 = ranges[operation1][magnitude_idx1]
- self.p2 = p2
- self.operation2 = func[operation2]
- self.magnitude2 = ranges[operation2][magnitude_idx2]
-
- def __call__(self, img):
- if random.random() < self.p1: img = self.operation1(img, self.magnitude1)
- if random.random() < self.p2: img = self.operation2(img, self.magnitude2)
- return img
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