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| """Dataset class template | |
| This module provides a template for users to implement custom datasets. | |
| You can specify '--dataset_mode template' to use this dataset. | |
| The class name should be consistent with both the filename and its dataset_mode option. | |
| The filename should be <dataset_mode>_dataset.py | |
| The class name should be <Dataset_mode>Dataset.py | |
| You need to implement the following functions: | |
| -- <modify_commandline_options>: Add dataset-specific options and rewrite default values for existing options. | |
| -- <__init__>: Initialize this dataset class. | |
| -- <__getitem__>: Return a data point and its metadata information. | |
| -- <__len__>: Return the number of images. | |
| """ | |
| from data.base_dataset import BaseDataset, get_transform | |
| # from data.image_folder import make_dataset | |
| # from PIL import Image | |
| class TemplateDataset(BaseDataset): | |
| """A template dataset class for you to implement custom datasets.""" | |
| def modify_commandline_options(parser, is_train): | |
| """Add new dataset-specific options, and rewrite default values for existing options. | |
| Parameters: | |
| parser -- original option parser | |
| is_train (bool) -- whether training phase or test phase. You can use this flag to add training-specific or test-specific options. | |
| Returns: | |
| the modified parser. | |
| """ | |
| parser.add_argument('--new_dataset_option', type=float, default=1.0, help='new dataset option') | |
| parser.set_defaults(max_dataset_size=10, new_dataset_option=2.0) # specify dataset-specific default values | |
| return parser | |
| def __init__(self, opt): | |
| """Initialize this dataset class. | |
| Parameters: | |
| opt (Option class) -- stores all the experiment flags; needs to be a subclass of BaseOptions | |
| A few things can be done here. | |
| - save the options (have been done in BaseDataset) | |
| - get image paths and meta information of the dataset. | |
| - define the image transformation. | |
| """ | |
| # save the option and dataset root | |
| BaseDataset.__init__(self, opt) | |
| # get the image paths of your dataset; | |
| self.image_paths = [] # You can call sorted(make_dataset(self.root, opt.max_dataset_size)) to get all the image paths under the directory self.root | |
| # define the default transform function. You can use <base_dataset.get_transform>; You can also define your custom transform function | |
| self.transform = get_transform(opt) | |
| def __getitem__(self, index): | |
| """Return a data point and its metadata information. | |
| Parameters: | |
| index -- a random integer for data indexing | |
| Returns: | |
| a dictionary of data with their names. It usually contains the data itself and its metadata information. | |
| Step 1: get a random image path: e.g., path = self.image_paths[index] | |
| Step 2: load your data from the disk: e.g., image = Image.open(path).convert('RGB'). | |
| Step 3: convert your data to a PyTorch tensor. You can use helpder functions such as self.transform. e.g., data = self.transform(image) | |
| Step 4: return a data point as a dictionary. | |
| """ | |
| path = 'temp' # needs to be a string | |
| data_A = None # needs to be a tensor | |
| data_B = None # needs to be a tensor | |
| return {'data_A': data_A, 'data_B': data_B, 'path': path} | |
| def __len__(self): | |
| """Return the total number of images.""" | |
| return len(self.image_paths) | |