Source code for archai.supergraph.datasets.providers.sport8_provider

# Copyright (c) Microsoft Corporation.
# Licensed under the MIT license.

import os

import torchvision
from overrides import overrides
from torchvision.transforms import transforms

from archai.common import utils
from archai.common.config import Config
from archai.supergraph.datasets.dataset_provider import (
    DatasetProvider,
    ImgSize,
    TrainTestDatasets,
    register_dataset_provider,
)


class Sport8Provider(DatasetProvider):
    def __init__(self, conf_dataset:Config):
        super().__init__(conf_dataset)
        self._dataroot = utils.full_path(conf_dataset['dataroot'])

    @overrides
    def get_datasets(self, load_train:bool, load_test:bool,
                     transform_train, transform_test)->TrainTestDatasets:
        trainset, testset = None, None

        if load_train:
            trainpath = os.path.join(self._dataroot, 'sport8', 'train')
            trainset = torchvision.datasets.ImageFolder(trainpath, transform=transform_train)
        if load_test:
            testpath = os.path.join(self._dataroot, 'sport8', 'test')
            testset = torchvision.datasets.ImageFolder(testpath, transform=transform_test)

        return trainset, testset

    @overrides
    def get_transforms(self, img_size:ImgSize)->tuple:
        # MEAN, STD computed for sport8
        MEAN = [0.4734, 0.4856, 0.4526]
        STD = [0.2478, 0.2444, 0.2667]

        # transformations match that in
        # https://github.com/antoyang/NAS-Benchmark/blob/master/DARTS/preproc.py
        train_transf = [
            transforms.RandomResizedCrop(224),
            transforms.RandomHorizontalFlip(),
            transforms.ColorJitter(
                brightness=0.4,
                contrast=0.4,
                saturation=0.4,
                hue=0.2)
        ]

        test_transf = [transforms.Resize(256), transforms.CenterCrop(224)]

        normalize = [
            transforms.ToTensor(),
            transforms.Normalize(MEAN, STD)
        ]

        train_transform = transforms.Compose(train_transf + normalize)
        test_transform = transforms.Compose(test_transf + normalize)

        return train_transform, test_transform

register_dataset_provider('sport8', Sport8Provider)