def _split_sampler()

in 01-byoc/code/dataloader.py [0:0]

• 19 lines of code
• 3 McCabe index (conditional complexity)

    def _split_sampler(self, split):
        if split == 0.0:
            return None, None

        idx_full = np.arange(self.n_samples)

        np.random.seed(0)
        np.random.shuffle(idx_full)

        if isinstance(split, int):
            assert split > 0
            assert split < self.n_samples, "validation set size is configured to be larger than entire dataset."
            len_valid = split
        else:
            len_valid = int(self.n_samples * split)

        valid_idx = idx_full[0:len_valid]
        train_idx = np.delete(idx_full, np.arange(0, len_valid))

        train_sampler = SubsetRandomSampler(train_idx)
        valid_sampler = SubsetRandomSampler(valid_idx)

        # turn off shuffle option which is mutually exclusive with sampler
        self.shuffle = False
        self.n_samples = len(train_idx)

        return train_sampler, valid_sampler