randaugment代码
时间: 2023-07-02 17:11:02 浏览: 90
RandAugment是一种数据增强方法,可以自动增强数据集以提高模型的泛化能力。以下是RandAugment的Python代码示例:
```python
import random
from PIL import Image, ImageOps
import numpy as np
def apply_op(image, op, severity):
# 对图像应用指定强度的操作
image = np.clip(image * 255., 0, 255).astype(np.uint8)
pil_img = Image.fromarray(image)
pil_img = op(pil_img, severity)
return np.asarray(pil_img) / 255.
def augment_list():
# 定义一组增强操作
return [
(Identity, 0., 9),
(AutoContrast, 0., 9),
(Equalize, 0., 9),
(Invert, 0., 9),
(Rotate, 0, 30),
(Posterize, 0, 4),
(Solarize, 0, 256),
(SolarizeAdd, 0., 110),
(Color, 0.1, 1.9),
(Contrast, 0.1, 1.9),
(Brightness, 0.1, 1.9),
(Sharpness, 0.1, 1.9),
(ShearX, 0., 0.3),
(ShearY, 0., 0.3),
(TranslateX, 0., 0.45),
(TranslateY, 0., 0.45),
]
def apply_augment(image, severity=3, num_layers=2):
# 对图像随机应用多个增强操作
ops = augment_list()
np.random.shuffle(ops)
for i in range(num_layers):
op, min_val, max_val = ops[i]
val = (float(severity) / 10) * float(max_val - min_val) + min_val
image = apply_op(image, op, val)
return image
# 下面是每个操作的代码实现
def Identity(img, _):
return img
def AutoContrast(img, _):
return ImageOps.autocontrast(img)
def Equalize(img, _):
return ImageOps.equalize(img)
def Invert(img, _):
return ImageOps.invert(img)
def Rotate(img, magnitude):
rot = img.convert("RGBA").rotate(magnitude)
return Image.composite(rot, Image.new("RGBA", rot.size), rot)
def Posterize(img, magnitude):
level = int((magnitude / 30.) * 4)
return ImageOps.posterize(img, level)
def Solarize(img, magnitude):
threshold = int((magnitude / 30.) * 256)
return ImageOps.solarize(img, threshold)
def SolarizeAdd(img, magnitude):
threshold = int((magnitude / 30.) * 110)
img = np.array(img).astype(np.int)
img += threshold
return Image.fromarray(np.clip(img, 0, 255).astype(np.uint8))
def Color(img, magnitude):
magnitude = 1. + magnitude
return ImageEnhance.Color(img).enhance(magnitude)
def Contrast(img, magnitude):
magnitude = 1. + magnitude
return ImageEnhance.Contrast(img).enhance(magnitude)
def Brightness(img, magnitude):
magnitude = 1. + magnitude
return ImageEnhance.Brightness(img).enhance(magnitude)
def Sharpness(img, magnitude):
magnitude = 1. + magnitude
return ImageEnhance.Sharpness(img).enhance(magnitude)
def ShearX(img, magnitude):
return img.transform(img.size, Image.AFFINE, (1, magnitude * random.choice([-1, 1]), 0, 0, 1, 0))
def ShearY(img, magnitude):
return img.transform(img.size, Image.AFFINE, (1, 0, 0, magnitude * random.choice([-1, 1]), 1, 0))
def TranslateX(img, magnitude):
return img.transform(img.size, Image.AFFINE, (1, 0, magnitude * img.size[0] * random.choice([-1, 1]), 0, 1, 0))
def TranslateY(img, magnitude):
return img.transform(img.size, Image.AFFINE, (1, 0, 0, 0, 1, magnitude * img.size[1] * random.choice([-1, 1])))
```
上述代码中的每个函数实现了一种数据增强操作,例如 `AutoContrast` 函数对图像应用自动对比度增强,`Equalize` 函数对图像应用直方图均衡化,`Rotate` 函数将图像旋转一定角度等。在使用 RandAugment 进行数据增强时,可以随机选择一组增强操作并以不同的强度应用它们,从而生成多样化的训练样本。
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