fairseq/fairseq_cli/hydra_validate.py

#!/usr/bin/env python3 -u
# Copyright (c) Facebook, Inc. and its affiliates.
#
# This source code is licensed under the MIT license found in the
# LICENSE file in the root directory of this source tree.

import logging
import os
import sys
from itertools import chain

import torch
from hydra.core.hydra_config import HydraConfig
from omegaconf import OmegaConf, open_dict
import hydra

from fairseq import checkpoint_utils, distributed_utils, utils
from fairseq.dataclass.configs import FairseqConfig
from fairseq.dataclass.initialize import add_defaults, hydra_init
from fairseq.dataclass.utils import omegaconf_no_object_check
from fairseq.distributed import utils as distributed_utils
from fairseq.logging import metrics, progress_bar
from fairseq.utils import reset_logging

logging.basicConfig(
    format="%(asctime)s | %(levelname)s | %(name)s | %(message)s",
    datefmt="%Y-%m-%d %H:%M:%S",
    level=os.environ.get("LOGLEVEL", "INFO").upper(),
    stream=sys.stdout,
)
logger = logging.getLogger("fairseq_cli.validate")


@hydra.main(config_path=os.path.join("..", "fairseq", "config"), config_name="config")
def hydra_main(cfg: FairseqConfig) -> float:
    return _hydra_main(cfg)


def _hydra_main(cfg: FairseqConfig, **kwargs) -> float:
    add_defaults(cfg)

    if cfg.common.reset_logging:
        reset_logging()  # Hydra hijacks logging, fix that
    else:
        # check if directly called or called through hydra_main
        if HydraConfig.initialized():
            with open_dict(cfg):
                # make hydra logging work with ddp (see # see https://github.com/facebookresearch/hydra/issues/1126)
                cfg.job_logging_cfg = OmegaConf.to_container(
                    HydraConfig.get().job_logging, resolve=True
                )

    with omegaconf_no_object_check():
        cfg = OmegaConf.create(
            OmegaConf.to_container(cfg, resolve=True, enum_to_str=True)
        )
    OmegaConf.set_struct(cfg, True)

    assert (
        cfg.dataset.max_tokens is not None or cfg.dataset.batch_size is not None
    ), "Must specify batch size either with --max-tokens or --batch-size"

    distributed_utils.call_main(cfg, validate, **kwargs)


def validate(cfg):
    utils.import_user_module(cfg.common)

    use_fp16 = cfg.common.fp16
    use_cuda = torch.cuda.is_available() and not cfg.common.cpu

    if use_cuda:
        torch.cuda.set_device(cfg.distributed_training.device_id)

    if cfg.distributed_training.distributed_world_size > 1:
        data_parallel_world_size = distributed_utils.get_data_parallel_world_size()
        data_parallel_rank = distributed_utils.get_data_parallel_rank()
    else:
        data_parallel_world_size = 1
        data_parallel_rank = 0

    overrides = {"task": {"data": cfg.task.data}}

    # Load ensemble
    logger.info("loading model(s) from {}".format(cfg.common_eval.path))
    models, saved_cfg, task = checkpoint_utils.load_model_ensemble_and_task(
        [cfg.common_eval.path],
        arg_overrides=overrides,
        suffix=cfg.checkpoint.checkpoint_suffix,
    )
    model = models[0]

    # Move models to GPU
    for model in models:
        model.eval()
        if use_fp16:
            model.half()
        if use_cuda:
            model.cuda()

    # Print args
    logger.info(saved_cfg)

    # Build criterion
    criterion = task.build_criterion(saved_cfg.criterion, from_checkpoint=True)
    criterion.eval()

    for subset in cfg.dataset.valid_subset.split(","):
        try:
            task.load_dataset(subset, combine=False, epoch=1, task_cfg=saved_cfg.task)
            dataset = task.dataset(subset)
        except KeyError:
            raise Exception("Cannot find dataset: " + subset)

        # Initialize data iterator
        itr = task.get_batch_iterator(
            dataset=dataset,
            max_tokens=cfg.dataset.max_tokens,
            max_sentences=cfg.dataset.batch_size,
            max_positions=utils.resolve_max_positions(
                task.max_positions(),
                *[m.max_positions() for m in models],
            ),
            ignore_invalid_inputs=cfg.dataset.skip_invalid_size_inputs_valid_test,
            required_batch_size_multiple=cfg.dataset.required_batch_size_multiple,
            seed=cfg.common.seed,
            num_shards=data_parallel_world_size,
            shard_id=data_parallel_rank,
            num_workers=cfg.dataset.num_workers,
            data_buffer_size=cfg.dataset.data_buffer_size,
        ).next_epoch_itr(shuffle=False)
        progress = progress_bar.progress_bar(
            itr,
            log_format=cfg.common.log_format,
            log_interval=cfg.common.log_interval,
            prefix=f"valid on '{subset}' subset",
            default_log_format=("tqdm" if not cfg.common.no_progress_bar else "simple"),
        )

        def apply_half(t):
            if t.dtype is torch.float32:
                return t.to(dtype=torch.half)
            return t

        log_outputs = []
        for i, sample in enumerate(progress):
            sample = utils.move_to_cuda(sample) if use_cuda else sample

            if use_fp16:
                sample = utils.apply_to_sample(apply_half, sample)

            _loss, _sample_size, log_output = task.valid_step(sample, model, criterion)
            with metrics.aggregate() as agg:
                task.reduce_metrics([log_output], criterion)
                progress.log(agg.get_smoothed_values(), step=i)
            # progress.log(log_output, step=i) from vision
            log_outputs.append(log_output)

        if data_parallel_world_size > 1:
            log_outputs = distributed_utils.all_gather_list(
                log_outputs,
                max_size=cfg.common.all_gather_list_size,
                group=distributed_utils.get_data_parallel_group(),
            )
            log_outputs = list(chain.from_iterable(log_outputs))

        with metrics.aggregate() as agg:
            task.reduce_metrics(log_outputs, criterion)
            log_output = agg.get_smoothed_values()

        progress.print(log_output, tag=subset, step=i)


def cli_main():
    try:
        from hydra._internal.utils import get_args

        cfg_name = get_args().config_name or "config"
    except:
        logger.warning("Failed to get config name from hydra args")
        cfg_name = "config"

    hydra_init(cfg_name)
    hydra_main()


if __name__ == "__main__":
    cli_main()