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| """This module contains simple helper functions """ | |
| from __future__ import print_function | |
| import torch | |
| import numpy as np | |
| import os | |
| import imageio | |
| def tensor2im(input_image, imtype=np.uint8): | |
| """"Converts a Tensor array into a numpy image array. | |
| Parameters: | |
| input_image (tensor) -- the input image tensor array | |
| imtype (type) -- the desired type of the converted numpy array | |
| """ | |
| if not isinstance(input_image, np.ndarray): | |
| if isinstance(input_image, torch.Tensor): # get the data from a variable | |
| image_tensor = input_image.data | |
| else: | |
| return input_image | |
| image_numpy = image_tensor[0].cpu().float().numpy() # convert it into a numpy array | |
| if image_numpy.shape[0] == 1: # grayscale to RGB | |
| image_numpy = np.tile(image_numpy, (3, 1, 1)) | |
| image_numpy = (np.transpose(image_numpy, (1, 2, 0)) + 1) / 2.0 * 255.0 # post-processing: tranpose and scaling | |
| else: # if it is a numpy array, do nothing | |
| image_numpy = input_image | |
| return image_numpy.astype(imtype) | |
| def tensor2array(value_tensor): | |
| """Converts a Tensor array into a numpy | |
| :param value_tensor: | |
| :return: | |
| """ | |
| if value_tensor.dim() == 3: | |
| numpy = value_tensor.view(-1).cpu().float().numpy() | |
| else: | |
| numpy = value_tensor[0].view(-1).cpu().float().numpy() | |
| return numpy | |
| def save_image(image_numpy, image_path): | |
| """Save a numpy image to the disk | |
| Parameters: | |
| image_numpy (numpy array) -- input numpy array | |
| image_path (str) -- the path of the image | |
| """ | |
| if image_numpy.shape[2] == 1: | |
| image_numpy = image_numpy.reshape(image_numpy.shape[0], image_numpy.shape[1]) | |
| imageio.imwrite(image_path, image_numpy) | |
| def mkdirs(paths): | |
| """create empty directories if they don't exist | |
| Parameters: | |
| paths (str list) -- a list of directory paths | |
| """ | |
| if isinstance(paths, list) and not isinstance(paths, str): | |
| for path in paths: | |
| mkdir(path) | |
| else: | |
| mkdir(paths) | |
| def mkdir(path): | |
| """create a single empty directory if it didn't exist | |
| Parameters: | |
| path (str) -- a single directory path | |
| """ | |
| if not os.path.exists(path): | |
| os.makedirs(path) |