Pad each batch, not the whole dataset #30
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sshleifer
changed the title
sshleifer
commented
Oct 1, 2019
| return train_loader, valid_loader, train_sampler, valid_sampler | ||
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| def make_data_lists(args, personachat, tokenizer): |
| for utterance in dialog["utterances"]: | ||
| history = utterance["history"][-(2*args.max_history+1):] | ||
| candidate_instances = defaultdict(list) | ||
| history = utterance["history"][-(2 * args.max_history + 1):] |
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could add assert len(utterance['candidates']) >= num_candidates
| return instance, sequence # TODO: second arg is never used, delete it | ||
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| def pad_and_tensorize(batch_dict, padding): |
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this and ChatDataset should be easy to unit test
| valid_dataset = ChatDataset(datasets['valid'], pad_id) | ||
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| logger.info("Build train and validation dataloaders") | ||
| train_sampler = torch.utils.data.distributed.DistributedSampler(train_dataset) if args.distributed else None |
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(maybe) put this in ChatDataset.to_loader(self, args, shuffle) -> sampler, loader
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at some point might also want to document which tensors are 3D
| for input_name, input_array in instance.items(): | ||
| datasets[dataset_name][input_name].append(input_array) | ||
| candidate_instances[input_name].append(input_array) | ||
| for k in candidate_instances.keys(): |
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.items() will save some chars
train.py
Outdated
| for j, candidate in enumerate(utterance["candidates"][-num_candidates:]): | ||
| lm_labels = bool(j == num_candidates-1) | ||
| instance, _ = build_input_from_segments(persona, history, candidate, tokenizer, lm_labels) | ||
| lm_labels = bool(j == num_candidates - 1) |
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Previously, each sequence was padded to the length of the longest sequence in the dataset.
In this PR, each batch is padded to the length of the longest sequence in the batch. This results in a 30% speedup with negligible impact on metrics.
Code Changes
ChatDatasetyields example dicts like{'input_ids': [[hist + cand1], ..[hist +cand_n]],}for thePADDED_INPUTSandmc_token_idsandmc_labelsin the same format as previously.ChatDataset().collate_fn(examples: list)turns a list of example dicts into the list of 5 tensors by batching them and padding themget_dataloadersdoes much lessconvai_evaluation.pystill calls the oldpad_dataset1 Epoch Sanity Check
Before Change: 85 minutes
Validation: {'accuracy': 0.7483655941545956,
'average_accuracy': 0.7483655941545956,
'average_nll': 2.6815188920676687,
'average_ppl': 14.607263311061963,
'nll': 2.6815188920676687}
After Change: 60 minutes
Validation: {'accuracy': 0.7466991411357519,
'average_accuracy': 0.7466991411357519,
'average_nll': 2.6821035040007972,
'average_ppl': 14.615805388160778,
'nll': 2.6821035040007972}
Command: