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preprocess.py
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preprocess.py
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import torch
import torchvision.transforms as transforms
import random
import numpy as np
__imagenet_stats = {'mean': [0.485, 0.456, 0.406],
'std': [0.229, 0.224, 0.225]}
__tiny_imagenet_stats = {'mean': [0.4802, 0.4481, 0.3975],
'std': [0.2302, 0.2265, 0.2262]}
__imagenet_pca = {
'eigval': torch.Tensor([0.2175, 0.0188, 0.0045]),
'eigvec': torch.Tensor([
[-0.5675, 0.7192, 0.4009],
[-0.5808, -0.0045, -0.8140],
[-0.5836, -0.6948, 0.4203],
])
}
__cifar10_stats = {'mean': [0.4914, 0.4822, 0.4465],
'std': [0.2023, 0.1994, 0.2010]}
__cifar100_stats = {'mean': [0.5071, 0.4867, 0.4408],
'std': [0.2675, 0.2565, 0.2761]}
def get_transform_medium_scale_data(name='cifar10', input_size=None,
scale_size=None, normalize=None, isTrain=True):
if 'cifar10' == name:
input_size = input_size or 32
normalize = normalize or __cifar10_stats
if isTrain:
scale_size = scale_size or 40 # this variable is already not useful anymore
return pad_random_crop(input_size, scale_size=scale_size,
normalize=normalize, fill=127)
else:
scale_size = scale_size or 32
return scale_crop(input_size=input_size,
scale_size=scale_size, normalize=normalize)
elif 'cifar100' == name:
input_size = input_size or 32
normalize = normalize or __cifar100_stats
if isTrain:
scale_size = scale_size or 40
return pad_random_crop(input_size, scale_size=scale_size,
normalize=normalize, fill=127)
else:
scale_size = scale_size or 32
return scale_crop(input_size=input_size,
scale_size=scale_size, normalize=normalize)
elif name == 'mnist':
normalize = {'mean': [0.5], 'std': [0.5]}
input_size = input_size or 28
if isTrain:
scale_size = scale_size or 32
return pad_random_crop(input_size, scale_size=scale_size,
normalize=normalize)
else:
scale_size = scale_size or 28
return scale_crop(input_size=input_size,
scale_size=scale_size, normalize=normalize)
elif name == 'tiny-imagenet-200':
normalize = normalize or __tiny_imagenet_stats
scale_size = scale_size or 256
input_size = input_size or 224
if isTrain:
return inception_preproccess(input_size, normalize=normalize)
else:
return scale_crop_tiny_imagenet_32X32(input_size=input_size,
scale_size=scale_size, normalize=normalize)
elif name == 'stl10':
return transforms.Compose([
#transforms.Grayscale(),
transforms.ToTensor()
# transforms.Lambda(lambda x: x.repeat(1, 1, 1)),
])
elif name == 'svhn':
if isTrain:
return transforms.Compose([
transforms.RandomCrop(32, padding=4),
transforms.RandomHorizontalFlip(),
transforms.ToTensor()
])
else:
return transforms.Compose([
transforms.ToTensor()
])
# elif name == 'chexpert':
# return transforms.Compose([
# transforms.Resize(scale_size) if scale_size else transforms.Lambda(lambda x: x),
# transforms.CenterCrop(320 if not scale_size else scale_size),
# lambda x: torch.from_numpy(np.array(x, copy=True)).float().div(255).unsqueeze(0), # tensor in [0,1]
# transforms.Normalize(mean=[0.5330], std=[0.0349]), # whiten with dataset mean and std
# lambda x: x.expand(3, -1, -1)])
def get_data_transform_ImageNet_iNaturalist18(split, rgb_mean, rbg_std, key = 'ImageNet'):
data_transforms = {
'train': transforms.Compose([
transforms.RandomResizedCrop(224),
transforms.RandomHorizontalFlip(),
transforms.ToTensor(),
transforms.Normalize(rgb_mean, rbg_std)
]) if key == 'iNaturalist18' else transforms.Compose([
transforms.RandomResizedCrop(224),
transforms.RandomHorizontalFlip(),
transforms.ColorJitter(brightness=0.4, contrast=0.4, saturation=0.4, hue=0),
transforms.ToTensor(),
transforms.Normalize(rgb_mean, rbg_std)
]) ,
'val': transforms.Compose([
transforms.Resize(256),
transforms.CenterCrop(224),
transforms.ToTensor(),
transforms.Normalize(rgb_mean, rbg_std)
]),
'test': transforms.Compose([
transforms.Resize(256),
transforms.CenterCrop(224),
transforms.ToTensor(),
transforms.Normalize(rgb_mean, rbg_std)
])
}
return data_transforms[split]
def scale_crop(input_size, scale_size=None, normalize=__imagenet_stats):
t_list = [
transforms.CenterCrop(input_size), #center crop
transforms.ToTensor(),
transforms.Normalize(**normalize), # Normalization Data
]
if scale_size != input_size:
t_list = [transforms.Scale(scale_size)] + t_list
return transforms.Compose(t_list)
def scale_crop_tiny_imagenet_32X32(input_size, scale_size=None, normalize=__imagenet_stats):
t_list = [
transforms.Resize(input_size),
transforms.ToTensor(),
transforms.Normalize(**normalize),
]
return transforms.Compose(t_list)
def scale_random_crop(input_size, scale_size=None, normalize=__imagenet_stats):
t_list = [
transforms.RandomCrop(input_size),
transforms.RandomHorizontalFlip(),
transforms.ToTensor(),
transforms.Normalize(**normalize),
]
if scale_size != input_size:
t_list = [transforms.Scale(scale_size)] + t_list
return transforms.Compose(t_list)
def pad_random_crop(input_size, scale_size=None, normalize=__imagenet_stats, fill=0):
#padding = int((scale_size - input_size) / 2)
return transforms.Compose([
#transforms.Pad(padding, fill=fill), # fill = 127
transforms.RandomCrop(input_size, padding=4), # 32
transforms.RandomHorizontalFlip(), # Random Crop
transforms.ToTensor(),
transforms.Normalize(**normalize),
])
def inception_preproccess(input_size, normalize=__imagenet_stats):
return transforms.Compose([
transforms.RandomSizedCrop(input_size),
transforms.RandomHorizontalFlip(),
transforms.ToTensor(),
transforms.Normalize(**normalize)
])
def inception_color_preproccess(input_size, normalize=__imagenet_stats):
return transforms.Compose([
transforms.RandomSizedCrop(input_size),
transforms.RandomHorizontalFlip(),
transforms.ToTensor(),
ColorJitter(
brightness=0.4,
contrast=0.4,
saturation=0.4,
),
Lighting(0.1, __imagenet_pca['eigval'], __imagenet_pca['eigvec']),
transforms.Normalize(**normalize)
])
class Lighting(object):
"""Lighting noise(AlexNet - style PCA - based noise)"""
def __init__(self, alphastd, eigval, eigvec):
self.alphastd = alphastd
self.eigval = eigval
self.eigvec = eigvec
def __call__(self, img):
if self.alphastd == 0:
return img
alpha = img.new().resize_(3).normal_(0, self.alphastd)
rgb = self.eigvec.type_as(img).clone()\
.mul(alpha.view(1, 3).expand(3, 3))\
.mul(self.eigval.view(1, 3).expand(3, 3))\
.sum(1).squeeze()
return img.add(rgb.view(3, 1, 1).expand_as(img))
class Grayscale(object):
def __call__(self, img):
gs = img.copy()
gs[0].mul_(0.299).add_(0.587, gs[1]).add_(0.114, gs[2])
gs[1].copy_(gs[0])
gs[2].copy_(gs[0])
return gs
class Saturation(object):
def __init__(self, var):
self.var = var
def __call__(self, img):
gs = Grayscale()(img)
alpha = random.uniform(0, self.var)
return img.lerp(gs, alpha)
class Brightness(object):
def __init__(self, var):
self.var = var
def __call__(self, img):
gs = img.new().resize_as_(img).zero_()
alpha = random.uniform(0, self.var)
return img.lerp(gs, alpha)
class Contrast(object):
def __init__(self, var):
self.var = var
def __call__(self, img):
gs = Grayscale()(img)
gs.fill_(gs.mean())
alpha = random.uniform(0, self.var)
return img.lerp(gs, alpha)
class RandomOrder(object):
""" Composes several transforms together in random order.
"""
def __init__(self, transforms):
self.transforms = transforms
def __call__(self, img):
if self.transforms is None:
return img
order = torch.randperm(len(self.transforms))
for i in order:
img = self.transforms[i](img)
return img
class ColorJitter(RandomOrder):
def __init__(self, brightness=0.4, contrast=0.4, saturation=0.4):
self.transforms = []
if brightness != 0:
self.transforms.append(Brightness(brightness))
if contrast != 0:
self.transforms.append(Contrast(contrast))
if saturation != 0:
self.transforms.append(Saturation(saturation))