# -*- coding: utf-8 -*-
# Copyright (c) Facebook, Inc. and its affiliates.

"""
This file contains components with some default boilerplate logic user may need
in training / testing. They will not work for everyone, but many users may find them useful.

The behavior of functions/classes in this file is subject to change,
since they are meant to represent the "common default behavior" people need in their projects.
"""

import argparse
import logging
import os
import sys
import time
import weakref
from collections import OrderedDict
from typing import Optional
import torch
from fvcore.nn.precise_bn import get_bn_modules
from omegaconf import OmegaConf
from torch.nn.parallel import DistributedDataParallel

import detectron2.data.transforms as T
from detectron2.checkpoint import DetectionCheckpointer
from detectron2.config import CfgNode, LazyConfig
from detectron2.data import (
    MetadataCatalog,
    build_detection_test_loader,
    build_detection_train_loader,
)
from detectron2.evaluation import (
    DatasetEvaluator,
    inference_on_dataset,
    print_csv_format,
    verify_results,
)
from detectron2.modeling import build_model
from detectron2.solver import build_lr_scheduler, build_optimizer
from detectron2.utils import comm
from detectron2.utils.collect_env import collect_env_info
from detectron2.utils.env import seed_all_rng
from detectron2.utils.events import CommonMetricPrinter, JSONWriter, TensorboardXWriter
from detectron2.utils.file_io import PathManager
from detectron2.utils.logger import setup_logger

from detectron2.engine import hooks
from detectron2.engine.train_loop import AMPTrainer, SimpleTrainer, TrainerBase

from .mycheckpointer import MyDetectionCheckpointer
from typing import Any, Dict, List, Set
import itertools
from detectron2.solver.build import maybe_add_gradient_clipping
from .dataset_mapper import DetrDatasetMapper
from .icdar_evaluation import ICDAREvaluator
from detectron2.evaluation import COCOEvaluator

__all__ = [
    "create_ddp_model",
    "default_argument_parser",
    "default_setup",
    "default_writers",
    "DefaultPredictor",
    "MyTrainer",
]


def create_ddp_model(model, *, fp16_compression=False, **kwargs):
    """
    Create a DistributedDataParallel model if there are >1 processes.

    Args:
        model: a torch.nn.Module
        fp16_compression: add fp16 compression hooks to the ddp object.
            See more at https://pytorch.org/docs/stable/ddp_comm_hooks.html#torch.distributed.algorithms.ddp_comm_hooks.default_hooks.fp16_compress_hook
        kwargs: other arguments of :module:`torch.nn.parallel.DistributedDataParallel`.
    """  # noqa
    if comm.get_world_size() == 1:
        return model
    if "device_ids" not in kwargs:
        kwargs["device_ids"] = [comm.get_local_rank()]
    ddp = DistributedDataParallel(model, **kwargs)
    if fp16_compression:
        from torch.distributed.algorithms.ddp_comm_hooks import default as comm_hooks

        ddp.register_comm_hook(state=None, hook=comm_hooks.fp16_compress_hook)
    return ddp


def default_argument_parser(epilog=None):
    """
    Create a parser with some common arguments used by detectron2 users.

    Args:
        epilog (str): epilog passed to ArgumentParser describing the usage.

    Returns:
        argparse.ArgumentParser:
    """
    parser = argparse.ArgumentParser(
        epilog=epilog
        or f"""
Examples:

Run on single machine:
    $ {sys.argv[0]} --num-gpus 8 --config-file cfg.yaml

Change some config options:
    $ {sys.argv[0]} --config-file cfg.yaml MODEL.WEIGHTS /path/to/weight.pth SOLVER.BASE_LR 0.001

Run on multiple machines:
    (machine0)$ {sys.argv[0]} --machine-rank 0 --num-machines 2 --dist-url <URL> [--other-flags]
    (machine1)$ {sys.argv[0]} --machine-rank 1 --num-machines 2 --dist-url <URL> [--other-flags]
""",
        formatter_class=argparse.RawDescriptionHelpFormatter,
    )
    parser.add_argument("--config-file", default="", metavar="FILE", help="path to config file")
    parser.add_argument(
        "--resume",
        action="store_true",
        help="Whether to attempt to resume from the checkpoint directory. "
        "See documentation of `MyTrainer.resume_or_load()` for what it means.",
    )
    parser.add_argument("--eval-only", action="store_true", help="perform evaluation only")
    parser.add_argument("--num-gpus", type=int, default=1, help="number of gpus *per machine*")
    parser.add_argument("--num-machines", type=int, default=1, help="total number of machines")
    parser.add_argument(
        "--machine-rank", type=int, default=0, help="the rank of this machine (unique per machine)"
    )

    # PyTorch still may leave orphan processes in multi-gpu training.
    # Therefore we use a deterministic way to obtain port,
    # so that users are aware of orphan processes by seeing the port occupied.
    port = 2 ** 15 + 2 ** 14 + hash(os.getuid() if sys.platform != "win32" else 1) % 2 ** 14
    parser.add_argument(
        "--dist-url",
        default="tcp://127.0.0.1:{}".format(port),
        help="initialization URL for pytorch distributed backend. See "
        "https://pytorch.org/docs/stable/distributed.html for details.",
    )
    parser.add_argument(
        "opts",
        help="""
Modify config options at the end of the command. For Yacs configs, use
space-separated "PATH.KEY VALUE" pairs.
For python-based LazyConfig, use "path.key=value".
        """.strip(),
        default=None,
        nargs=argparse.REMAINDER,
    )
    return parser


def _try_get_key(cfg, *keys, default=None):
    """
    Try select keys from cfg until the first key that exists. Otherwise return default.
    """
    if isinstance(cfg, CfgNode):
        cfg = OmegaConf.create(cfg.dump())
    for k in keys:
        none = object()
        p = OmegaConf.select(cfg, k, default=none)
        if p is not none:
            return p
    return default


def _highlight(code, filename):
    try:
        import pygments
    except ImportError:
        return code

    from pygments.lexers import Python3Lexer, YamlLexer
    from pygments.formatters import Terminal256Formatter

    lexer = Python3Lexer() if filename.endswith(".py") else YamlLexer()
    code = pygments.highlight(code, lexer, Terminal256Formatter(style="monokai"))
    return code


def default_setup(cfg, args):
    """
    Perform some basic common setups at the beginning of a job, including:

    1. Set up the detectron2 logger
    2. Log basic information about environment, cmdline arguments, and config
    3. Backup the config to the output directory

    Args:
        cfg (CfgNode or omegaconf.DictConfig): the full config to be used
        args (argparse.NameSpace): the command line arguments to be logged
    """
    output_dir = _try_get_key(cfg, "OUTPUT_DIR", "output_dir", "train.output_dir")
    if comm.is_main_process() and output_dir:
        PathManager.mkdirs(output_dir)

    rank = comm.get_rank()
    setup_logger(output_dir, distributed_rank=rank, name="fvcore")
    logger = setup_logger(output_dir, distributed_rank=rank)

    logger.info("Rank of current process: {}. World size: {}".format(rank, comm.get_world_size()))
    logger.info("Environment info:\n" + collect_env_info())

    logger.info("Command line arguments: " + str(args))
    if hasattr(args, "config_file") and args.config_file != "":
        logger.info(
            "Contents of args.config_file={}:\n{}".format(
                args.config_file,
                _highlight(PathManager.open(args.config_file, "r").read(), args.config_file),
            )
        )

    if comm.is_main_process() and output_dir:
        # Note: some of our scripts may expect the existence of
        # config.yaml in output directory
        path = os.path.join(output_dir, "config.yaml")
        if isinstance(cfg, CfgNode):
            logger.info("Running with full config:\n{}".format(_highlight(cfg.dump(), ".yaml")))
            with PathManager.open(path, "w") as f:
                f.write(cfg.dump())
        else:
            LazyConfig.save(cfg, path)
        logger.info("Full config saved to {}".format(path))

    # make sure each worker has a different, yet deterministic seed if specified
    seed = _try_get_key(cfg, "SEED", "train.seed", default=-1)
    seed_all_rng(None if seed < 0 else seed + rank)

    # cudnn benchmark has large overhead. It shouldn't be used considering the small size of
    # typical validation set.
    if not (hasattr(args, "eval_only") and args.eval_only):
        torch.backends.cudnn.benchmark = _try_get_key(
            cfg, "CUDNN_BENCHMARK", "train.cudnn_benchmark", default=False
        )


def default_writers(output_dir: str, max_iter: Optional[int] = None):
    """
    Build a list of :class:`EventWriter` to be used.
    It now consists of a :class:`CommonMetricPrinter`,
    :class:`TensorboardXWriter` and :class:`JSONWriter`.

    Args:
        output_dir: directory to store JSON metrics and tensorboard events
        max_iter: the total number of iterations

    Returns:
        list[EventWriter]: a list of :class:`EventWriter` objects.
    """
    PathManager.mkdirs(output_dir)
    return [
        # It may not always print what you want to see, since it prints "common" metrics only.
        CommonMetricPrinter(max_iter),
        JSONWriter(os.path.join(output_dir, "metrics.json")),
        TensorboardXWriter(output_dir),
    ]


class DefaultPredictor:
    """
    Create a simple end-to-end predictor with the given config that runs on
    single device for a single input image.

    Compared to using the model directly, this class does the following additions:

    1. Load checkpoint from `cfg.MODEL.WEIGHTS`.
    2. Always take BGR image as the input and apply conversion defined by `cfg.INPUT.FORMAT`.
    3. Apply resizing defined by `cfg.INPUT.{MIN,MAX}_SIZE_TEST`.
    4. Take one input image and produce a single output, instead of a batch.

    This is meant for simple demo purposes, so it does the above steps automatically.
    This is not meant for benchmarks or running complicated inference logic.
    If you'd like to do anything more complicated, please refer to its source code as
    examples to build and use the model manually.

    Attributes:
        metadata (Metadata): the metadata of the underlying dataset, obtained from
            cfg.DATASETS.TEST.

    Examples:
    ::
        pred = DefaultPredictor(cfg)
        inputs = cv2.imread("input.jpg")
        outputs = pred(inputs)
    """

    def __init__(self, cfg):
        self.cfg = cfg.clone()  # cfg can be modified by model
        self.model = build_model(self.cfg)
        self.model.eval()
        if len(cfg.DATASETS.TEST):
            self.metadata = MetadataCatalog.get(cfg.DATASETS.TEST[0])

        checkpointer = DetectionCheckpointer(self.model)
        checkpointer.load(cfg.MODEL.WEIGHTS)

        self.aug = T.ResizeShortestEdge(
            [cfg.INPUT.MIN_SIZE_TEST, cfg.INPUT.MIN_SIZE_TEST], cfg.INPUT.MAX_SIZE_TEST
        )

        self.input_format = cfg.INPUT.FORMAT
        assert self.input_format in ["RGB", "BGR"], self.input_format

    def __call__(self, original_image):
        """
        Args:
            original_image (np.ndarray): an image of shape (H, W, C) (in BGR order).

        Returns:
            predictions (dict):
                the output of the model for one image only.
                See :doc:`/tutorials/models` for details about the format.
        """
        with torch.no_grad():  # https://github.com/sphinx-doc/sphinx/issues/4258
            # Apply pre-processing to image.
            if self.input_format == "RGB":
                # whether the model expects BGR inputs or RGB
                original_image = original_image[:, :, ::-1]
            height, width = original_image.shape[:2]
            image = self.aug.get_transform(original_image).apply_image(original_image)
            image = torch.as_tensor(image.astype("float32").transpose(2, 0, 1))

            inputs = {"image": image, "height": height, "width": width}
            predictions = self.model([inputs])[0]
            return predictions


class MyTrainer(TrainerBase):
    """
    A trainer with default training logic. It does the following:

    1. Create a :class:`SimpleTrainer` using model, optimizer, dataloader
       defined by the given config. Create a LR scheduler defined by the config.
    2. Load the last checkpoint or `cfg.MODEL.WEIGHTS`, if exists, when
       `resume_or_load` is called.
    3. Register a few common hooks defined by the config.

    It is created to simplify the **standard model training workflow** and reduce code boilerplate
    for users who only need the standard training workflow, with standard features.
    It means this class makes *many assumptions* about your training logic that
    may easily become invalid in a new research. In fact, any assumptions beyond those made in the
    :class:`SimpleTrainer` are too much for research.

    The code of this class has been annotated about restrictive assumptions it makes.
    When they do not work for you, you're encouraged to:

    1. Overwrite methods of this class, OR:
    2. Use :class:`SimpleTrainer`, which only does minimal SGD training and
       nothing else. You can then add your own hooks if needed. OR:
    3. Write your own training loop similar to `tools/plain_train_net.py`.

    See the :doc:`/tutorials/training` tutorials for more details.

    Note that the behavior of this class, like other functions/classes in
    this file, is not stable, since it is meant to represent the "common default behavior".
    It is only guaranteed to work well with the standard models and training workflow in detectron2.
    To obtain more stable behavior, write your own training logic with other public APIs.

    Examples:
    ::
        trainer = MyTrainer(cfg)
        trainer.resume_or_load()  # load last checkpoint or MODEL.WEIGHTS
        trainer.train()

    Attributes:
        scheduler:
        checkpointer (DetectionCheckpointer):
        cfg (CfgNode):
    """

    def __init__(self, cfg):
        """
        Args:
            cfg (CfgNode):
        """
        super().__init__()
        logger = logging.getLogger("detectron2")
        if not logger.isEnabledFor(logging.INFO):  # setup_logger is not called for d2
            setup_logger()
        cfg = MyTrainer.auto_scale_workers(cfg, comm.get_world_size())

        self.cfg = cfg

        # Assume these objects must be constructed in this order.
        model = self.build_model(cfg)
        optimizer = self.build_optimizer(cfg, model)
        data_loader = self.build_train_loader(cfg)

        model = create_ddp_model(model, broadcast_buffers=False)
        self._trainer = (AMPTrainer if cfg.SOLVER.AMP.ENABLED else SimpleTrainer)(
            model, data_loader, optimizer
        )

        self.scheduler = self.build_lr_scheduler(cfg, optimizer)
        self.checkpointer = MyDetectionCheckpointer(
            # Assume you want to save checkpoints together with logs/statistics
            model,
            cfg.OUTPUT_DIR,
            trainer=weakref.proxy(self),
        )
        self.start_iter = 0
        self.max_iter = cfg.SOLVER.MAX_ITER
        self.cfg = cfg

        self.register_hooks(self.build_hooks())

    def resume_or_load(self, resume=True):
        """
        If `resume==True` and `cfg.OUTPUT_DIR` contains the last checkpoint (defined by
        a `last_checkpoint` file), resume from the file. Resuming means loading all
        available states (eg. optimizer and scheduler) and update iteration counter
        from the checkpoint. ``cfg.MODEL.WEIGHTS`` will not be used.

        Otherwise, this is considered as an independent training. The method will load model
        weights from the file `cfg.MODEL.WEIGHTS` (but will not load other states) and start
        from iteration 0.

        Args:
            resume (bool): whether to do resume or not
        """
        self.checkpointer.resume_or_load(self.cfg.MODEL.WEIGHTS, resume=resume)
        if resume and self.checkpointer.has_checkpoint():
            # The checkpoint stores the training iteration that just finished, thus we start
            # at the next iteration
            self.start_iter = self.iter + 1

    def build_hooks(self):
        """
        Build a list of default hooks, including timing, evaluation,
        checkpointing, lr scheduling, precise BN, writing events.

        Returns:
            list[HookBase]:
        """
        cfg = self.cfg.clone()
        cfg.defrost()
        cfg.DATALOADER.NUM_WORKERS = 0  # save some memory and time for PreciseBN

        ret = [
            hooks.IterationTimer(),
            hooks.LRScheduler(),
            hooks.PreciseBN(
                # Run at the same freq as (but before) evaluation.
                cfg.TEST.EVAL_PERIOD,
                self.model,
                # Build a new data loader to not affect training
                self.build_train_loader(cfg),
                cfg.TEST.PRECISE_BN.NUM_ITER,
            )
            if cfg.TEST.PRECISE_BN.ENABLED and get_bn_modules(self.model)
            else None,
        ]

        # Do PreciseBN before checkpointer, because it updates the model and need to
        # be saved by checkpointer.
        # This is not always the best: if checkpointing has a different frequency,
        # some checkpoints may have more precise statistics than others.
        if comm.is_main_process():
            ret.append(hooks.PeriodicCheckpointer(self.checkpointer, cfg.SOLVER.CHECKPOINT_PERIOD))

        def test_and_save_results():
            self._last_eval_results = self.test(self.cfg, self.model)
            return self._last_eval_results

        # Do evaluation after checkpointer, because then if it fails,
        # we can use the saved checkpoint to debug.
        ret.append(hooks.EvalHook(cfg.TEST.EVAL_PERIOD, test_and_save_results))

        if comm.is_main_process():
            # Here the default print/log frequency of each writer is used.
            # run writers in the end, so that evaluation metrics are written
            ret.append(hooks.PeriodicWriter(self.build_writers(), period=20))
        return ret

    def build_writers(self):
        """
        Build a list of writers to be used using :func:`default_writers()`.
        If you'd like a different list of writers, you can overwrite it in
        your trainer.

        Returns:
            list[EventWriter]: a list of :class:`EventWriter` objects.
        """
        return default_writers(self.cfg.OUTPUT_DIR, self.max_iter)

    def train(self):
        """
        Run training.

        Returns:
            OrderedDict of results, if evaluation is enabled. Otherwise None.
        """
        super().train(self.start_iter, self.max_iter)
        if len(self.cfg.TEST.EXPECTED_RESULTS) and comm.is_main_process():
            assert hasattr(
                self, "_last_eval_results"
            ), "No evaluation results obtained during training!"
            verify_results(self.cfg, self._last_eval_results)
            return self._last_eval_results

    def run_step(self):
        self._trainer.iter = self.iter
        if self.cfg.SOLVER.GRADIENT_ACCUMULATION_STEPS == 1:
            self._trainer.run_step()
        else:
            self.run_step_grad_acc(gradient_accumulation_steps=self.cfg.SOLVER.GRADIENT_ACCUMULATION_STEPS)

    def run_step_grad_acc(self, gradient_accumulation_steps=1):
        """
        Implement the AMP training logic.
        The batch at each step will be divided by this integer and
        gradient will be accumulated over gradient_accumulation_steps steps.
        """
        assert self._trainer.model.training, "[AMPTrainer] model was changed to eval mode!"
        assert torch.cuda.is_available(), "[AMPTrainer] CUDA is required for AMP training!"
        from torch.cuda.amp import autocast

        start = time.perf_counter()
        data = next(self._trainer._data_loader_iter)
        data_time = time.perf_counter() - start

        with autocast():
            loss_dict = self._trainer.model(data)
            if isinstance(loss_dict, torch.Tensor):
                loss_dict = loss_dict / gradient_accumulation_steps
                losses = loss_dict
                loss_dict = {"total_loss": loss_dict}
            else:
                losses = sum(loss_dict.values())
                losses = losses / gradient_accumulation_steps

        self._trainer.grad_scaler.scale(losses).backward()

        if (self._trainer.iter + 1) % gradient_accumulation_steps == 0:

            self._trainer._write_metrics(loss_dict, data_time)

            self._trainer.grad_scaler.step(self._trainer.optimizer)
            self._trainer.grad_scaler.update()
            self._trainer.optimizer.zero_grad()

    @classmethod
    def build_model(cls, cfg):
        """
        Returns:
            torch.nn.Module:

        It now calls :func:`detectron2.modeling.build_model`.
        Overwrite it if you'd like a different model.
        """
        model = build_model(cfg)
        logger = logging.getLogger(__name__)
        logger.info("Model:\n{}".format(model))
        return model

    @classmethod
    def build_optimizer(cls, cfg, model):
        params: List[Dict[str, Any]] = []
        memo: Set[torch.nn.parameter.Parameter] = set()
        for key, value in model.named_parameters(recurse=True):
            if not value.requires_grad:
                continue
            # Avoid duplicating parameters
            if value in memo:
                continue
            memo.add(value)
            lr = cfg.SOLVER.BASE_LR
            weight_decay = cfg.SOLVER.WEIGHT_DECAY
            if "backbone" in key:
                lr = lr * cfg.SOLVER.BACKBONE_MULTIPLIER
            params += [{"params": [value], "lr": lr, "weight_decay": weight_decay}]

        def maybe_add_full_model_gradient_clipping(optim):  # optim: the optimizer class
            # detectron2 doesn't have full model gradient clipping now
            clip_norm_val = cfg.SOLVER.CLIP_GRADIENTS.CLIP_VALUE
            enable = (
                    cfg.SOLVER.CLIP_GRADIENTS.ENABLED
                    and cfg.SOLVER.CLIP_GRADIENTS.CLIP_TYPE == "full_model"
                    and clip_norm_val > 0.0
            )

            class FullModelGradientClippingOptimizer(optim):
                def step(self, closure=None):
                    all_params = itertools.chain(*[x["params"] for x in self.param_groups])
                    torch.nn.utils.clip_grad_norm_(all_params, clip_norm_val)
                    super().step(closure=closure)

            return FullModelGradientClippingOptimizer if enable else optim

        optimizer_type = cfg.SOLVER.OPTIMIZER
        if optimizer_type == "SGD":
            optimizer = maybe_add_full_model_gradient_clipping(torch.optim.SGD)(
                params, cfg.SOLVER.BASE_LR, momentum=cfg.SOLVER.MOMENTUM
            )
        elif optimizer_type == "ADAMW":
            optimizer = maybe_add_full_model_gradient_clipping(torch.optim.AdamW)(
                params, cfg.SOLVER.BASE_LR
            )
        else:
            raise NotImplementedError(f"no optimizer type {optimizer_type}")
        if not cfg.SOLVER.CLIP_GRADIENTS.CLIP_TYPE == "full_model":
            optimizer = maybe_add_gradient_clipping(cfg, optimizer)
        return optimizer

    @classmethod
    def build_lr_scheduler(cls, cfg, optimizer):
        """
        It now calls :func:`detectron2.solver.build_lr_scheduler`.
        Overwrite it if you'd like a different scheduler.
        """
        return build_lr_scheduler(cfg, optimizer)

    @classmethod
    def build_train_loader(cls, cfg):
        if cfg.AUG.DETR:
            mapper = DetrDatasetMapper(cfg, is_train=True)
        else:
            mapper = None
        return build_detection_train_loader(cfg, mapper=mapper)

    @classmethod
    def build_test_loader(cls, cfg, dataset_name):
        """
        Returns:
            iterable

        It now calls :func:`detectron2.data.build_detection_test_loader`.
        Overwrite it if you'd like a different data loader.
        """
        if cfg.AUG.DETR:
            mapper = DetrDatasetMapper(cfg, is_train=False)
        else:
            mapper = None
        return build_detection_test_loader(cfg, dataset_name, mapper=mapper)
        # Better to use mapper, which is the same as training.
        # The mapper does not influence the DiT model, but it is necessary for the LayoutLMv3 model
        # since we customize something in mapper.
        # return build_detection_test_loader(cfg, dataset_name)

    @classmethod
    def build_evaluator(cls, cfg, dataset_name, output_folder=None):
        if output_folder is None:
            output_folder = os.path.join(cfg.OUTPUT_DIR, "inference")
        if 'icdar' not in dataset_name:
            return COCOEvaluator(dataset_name, output_dir=output_folder)
        else:
            return ICDAREvaluator(dataset_name, output_dir=output_folder)

    @classmethod
    def test(cls, cfg, model, evaluators=None):
        """
        Evaluate the given model. The given model is expected to already contain
        weights to evaluate.

        Args:
            cfg (CfgNode):
            model (nn.Module):
            evaluators (list[DatasetEvaluator] or None): if None, will call
                :meth:`build_evaluator`. Otherwise, must have the same length as
                ``cfg.DATASETS.TEST``.

        Returns:
            dict: a dict of result metrics
        """
        logger = logging.getLogger(__name__)
        if isinstance(evaluators, DatasetEvaluator):
            evaluators = [evaluators]
        if evaluators is not None:
            assert len(cfg.DATASETS.TEST) == len(evaluators), "{} != {}".format(
                len(cfg.DATASETS.TEST), len(evaluators)
            )

        results = OrderedDict()
        for idx, dataset_name in enumerate(cfg.DATASETS.TEST):
            data_loader = cls.build_test_loader(cfg, dataset_name)
            # When evaluators are passed in as arguments,
            # implicitly assume that evaluators can be created before data_loader.
            if evaluators is not None:
                evaluator = evaluators[idx]
            else:
                try:
                    evaluator = cls.build_evaluator(cfg, dataset_name)
                except NotImplementedError:
                    logger.warn(
                        "No evaluator found. Use `MyTrainer.test(evaluators=)`, "
                        "or implement its `build_evaluator` method."
                    )
                    results[dataset_name] = {}
                    continue
            results_i = inference_on_dataset(model, data_loader, evaluator)
            results[dataset_name] = results_i
            if comm.is_main_process():
                assert isinstance(
                    results_i, dict
                ), "Evaluator must return a dict on the main process. Got {} instead.".format(
                    results_i
                )
                logger.info("Evaluation results for {} in csv format:".format(dataset_name))
                print_csv_format(results_i)

        if len(results) == 1:
            results = list(results.values())[0]
        return results

    @staticmethod
    def auto_scale_workers(cfg, num_workers: int):
        """
        When the config is defined for certain number of workers (according to
        ``cfg.SOLVER.REFERENCE_WORLD_SIZE``) that's different from the number of
        workers currently in use, returns a new cfg where the total batch size
        is scaled so that the per-GPU batch size stays the same as the
        original ``IMS_PER_BATCH // REFERENCE_WORLD_SIZE``.

        Other config options are also scaled accordingly:
        * training steps and warmup steps are scaled inverse proportionally.
        * learning rate are scaled proportionally, following :paper:`ImageNet in 1h`.

        For example, with the original config like the following:

        .. code-block:: yaml

            IMS_PER_BATCH: 16
            BASE_LR: 0.1
            REFERENCE_WORLD_SIZE: 8
            MAX_ITER: 5000
            STEPS: (4000,)
            CHECKPOINT_PERIOD: 1000

        When this config is used on 16 GPUs instead of the reference number 8,
        calling this method will return a new config with:

        .. code-block:: yaml

            IMS_PER_BATCH: 32
            BASE_LR: 0.2
            REFERENCE_WORLD_SIZE: 16
            MAX_ITER: 2500
            STEPS: (2000,)
            CHECKPOINT_PERIOD: 500

        Note that both the original config and this new config can be trained on 16 GPUs.
        It's up to user whether to enable this feature (by setting ``REFERENCE_WORLD_SIZE``).

        Returns:
            CfgNode: a new config. Same as original if ``cfg.SOLVER.REFERENCE_WORLD_SIZE==0``.
        """
        old_world_size = cfg.SOLVER.REFERENCE_WORLD_SIZE
        if old_world_size == 0 or old_world_size == num_workers:
            return cfg
        cfg = cfg.clone()
        frozen = cfg.is_frozen()
        cfg.defrost()

        assert (
            cfg.SOLVER.IMS_PER_BATCH % old_world_size == 0
        ), "Invalid REFERENCE_WORLD_SIZE in config!"
        scale = num_workers / old_world_size
        bs = cfg.SOLVER.IMS_PER_BATCH = int(round(cfg.SOLVER.IMS_PER_BATCH * scale))
        lr = cfg.SOLVER.BASE_LR = cfg.SOLVER.BASE_LR * scale
        max_iter = cfg.SOLVER.MAX_ITER = int(round(cfg.SOLVER.MAX_ITER / scale))
        warmup_iter = cfg.SOLVER.WARMUP_ITERS = int(round(cfg.SOLVER.WARMUP_ITERS / scale))
        cfg.SOLVER.STEPS = tuple(int(round(s / scale)) for s in cfg.SOLVER.STEPS)
        cfg.TEST.EVAL_PERIOD = int(round(cfg.TEST.EVAL_PERIOD / scale))
        cfg.SOLVER.CHECKPOINT_PERIOD = int(round(cfg.SOLVER.CHECKPOINT_PERIOD / scale))
        cfg.SOLVER.REFERENCE_WORLD_SIZE = num_workers  # maintain invariant
        logger = logging.getLogger(__name__)
        logger.info(
            f"Auto-scaling the config to batch_size={bs}, learning_rate={lr}, "
            f"max_iter={max_iter}, warmup={warmup_iter}."
        )

        if frozen:
            cfg.freeze()
        return cfg


# Access basic attributes from the underlying trainer
for _attr in ["model", "data_loader", "optimizer"]:
    setattr(
        MyTrainer,
        _attr,
        property(
            # getter
            lambda self, x=_attr: getattr(self._trainer, x),
            # setter
            lambda self, value, x=_attr: setattr(self._trainer, x, value),
        ),
    )
