about extract_data in preprocessor.py

[KYYOnull]

this func has no writing action to pkl files, it seems to have no contribution for the next training?

for dataset in dataset_splits:
    if dataset.mode != 'extract_data':
        raise Exception('Dataset mode should be extract_data')

data_loaders = []
for dataset in dataset_splits:
    dl = torch_data.DataLoader(
        dataset, batch_size=batch_size,
        shuffle=False, num_workers=num_workers)
    data_loaders.append(dl)

print("Extracting pre-processed data...")

num_mini_batches = sum(
    [len(data_loader) for data_loader in data_loaders])
mini_batch_count = 0

for data_loader in data_loaders:
    for i, _ in enumerate(data_loader):
        if verbose:
            print(
                "mini batch " + str(mini_batch_count + 1) + '/' + str(num_mini_batches))
            mini_batch_count += 1