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# Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved
import logging
import os
from collections import OrderedDict
from typing import List, Optional, Union
import torch
from torch import nn
from detectron2.checkpoint import DetectionCheckpointer
from detectron2.config import CfgNode
from detectron2.engine import DefaultTrainer
from detectron2.evaluation import (
DatasetEvaluator,
DatasetEvaluators,
inference_on_dataset,
print_csv_format,
)
from detectron2.solver.build import get_default_optimizer_params, maybe_add_gradient_clipping
from detectron2.utils import comm
from detectron2.utils.events import EventWriter, get_event_storage
from densepose import DensePoseDatasetMapperTTA, DensePoseGeneralizedRCNNWithTTA, load_from_cfg
from densepose.data import (
DatasetMapper,
build_combined_loader,
build_detection_test_loader,
build_detection_train_loader,
build_inference_based_loaders,
has_inference_based_loaders,
)
from densepose.evaluation.d2_evaluator_adapter import Detectron2COCOEvaluatorAdapter
from densepose.evaluation.evaluator import DensePoseCOCOEvaluator, build_densepose_evaluator_storage
from densepose.modeling.cse import Embedder
class SampleCountingLoader:
def __init__(self, loader):
self.loader = loader
def __iter__(self):
it = iter(self.loader)
storage = get_event_storage()
while True:
try:
batch = next(it)
num_inst_per_dataset = {}
for data in batch:
dataset_name = data["dataset"]
if dataset_name not in num_inst_per_dataset:
num_inst_per_dataset[dataset_name] = 0
num_inst = len(data["instances"])
num_inst_per_dataset[dataset_name] += num_inst
for dataset_name in num_inst_per_dataset:
storage.put_scalar(f"batch/{dataset_name}", num_inst_per_dataset[dataset_name])
yield batch
except StopIteration:
break
class SampleCountMetricPrinter(EventWriter):
def __init__(self):
self.logger = logging.getLogger(__name__)
def write(self):
storage = get_event_storage()
batch_stats_strs = []
for key, buf in storage.histories().items():
if key.startswith("batch/"):
batch_stats_strs.append(f"{key} {buf.avg(20)}")
self.logger.info(", ".join(batch_stats_strs))
class Trainer(DefaultTrainer):
@classmethod
def extract_embedder_from_model(cls, model: nn.Module) -> Optional[Embedder]:
if isinstance(model, nn.parallel.DistributedDataParallel):
model = model.module
if hasattr(model, "roi_heads") and hasattr(model.roi_heads, "embedder"):
return model.roi_heads.embedder
return None
# TODO: the only reason to copy the base class code here is to pass the embedder from
# the model to the evaluator; that should be refactored to avoid unnecessary copy-pasting
@classmethod
def test(
cls,
cfg: CfgNode,
model: nn.Module,
evaluators: Optional[Union[DatasetEvaluator, List[DatasetEvaluator]]] = None,
):
"""
Args:
cfg (CfgNode):
model (nn.Module):
evaluators (DatasetEvaluator, 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:
embedder = cls.extract_embedder_from_model(model)
evaluator = cls.build_evaluator(cfg, dataset_name, embedder=embedder)
except NotImplementedError:
logger.warn(
"No evaluator found. Use `DefaultTrainer.test(evaluators=)`, "
"or implement its `build_evaluator` method."
)
results[dataset_name] = {}
continue
if cfg.DENSEPOSE_EVALUATION.DISTRIBUTED_INFERENCE or comm.is_main_process():
results_i = inference_on_dataset(model, data_loader, evaluator)
else:
results_i = {}
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
@classmethod
def build_evaluator(
cls,
cfg: CfgNode,
dataset_name: str,
output_folder: Optional[str] = None,
embedder: Optional[Embedder] = None,
) -> DatasetEvaluators:
if output_folder is None:
output_folder = os.path.join(cfg.OUTPUT_DIR, "inference")
evaluators = []
distributed = cfg.DENSEPOSE_EVALUATION.DISTRIBUTED_INFERENCE
# Note: we currently use COCO evaluator for both COCO and LVIS datasets
# to have compatible metrics. LVIS bbox evaluator could also be used
# with an adapter to properly handle filtered / mapped categories
# evaluator_type = MetadataCatalog.get(dataset_name).evaluator_type
# if evaluator_type == "coco":
# evaluators.append(COCOEvaluator(dataset_name, output_dir=output_folder))
# elif evaluator_type == "lvis":
# evaluators.append(LVISEvaluator(dataset_name, output_dir=output_folder))
evaluators.append(
Detectron2COCOEvaluatorAdapter(
dataset_name, output_dir=output_folder, distributed=distributed
)
)
if cfg.MODEL.DENSEPOSE_ON:
storage = build_densepose_evaluator_storage(cfg, output_folder)
evaluators.append(
DensePoseCOCOEvaluator(
dataset_name,
distributed,
output_folder,
evaluator_type=cfg.DENSEPOSE_EVALUATION.TYPE,
min_iou_threshold=cfg.DENSEPOSE_EVALUATION.MIN_IOU_THRESHOLD,
storage=storage,
embedder=embedder,
should_evaluate_mesh_alignment=cfg.DENSEPOSE_EVALUATION.EVALUATE_MESH_ALIGNMENT,
mesh_alignment_mesh_names=cfg.DENSEPOSE_EVALUATION.MESH_ALIGNMENT_MESH_NAMES,
)
)
return DatasetEvaluators(evaluators)
@classmethod
def build_optimizer(cls, cfg: CfgNode, model: nn.Module):
params = get_default_optimizer_params(
model,
base_lr=cfg.SOLVER.BASE_LR,
weight_decay_norm=cfg.SOLVER.WEIGHT_DECAY_NORM,
bias_lr_factor=cfg.SOLVER.BIAS_LR_FACTOR,
weight_decay_bias=cfg.SOLVER.WEIGHT_DECAY_BIAS,
overrides={
"features": {
"lr": cfg.SOLVER.BASE_LR * cfg.MODEL.ROI_DENSEPOSE_HEAD.CSE.FEATURES_LR_FACTOR,
},
"embeddings": {
"lr": cfg.SOLVER.BASE_LR * cfg.MODEL.ROI_DENSEPOSE_HEAD.CSE.EMBEDDING_LR_FACTOR,
},
},
)
optimizer = torch.optim.SGD(
params,
cfg.SOLVER.BASE_LR,
momentum=cfg.SOLVER.MOMENTUM,
nesterov=cfg.SOLVER.NESTEROV,
weight_decay=cfg.SOLVER.WEIGHT_DECAY,
)
# pyre-fixme[6]: For 2nd param expected `Type[Optimizer]` but got `SGD`.
return maybe_add_gradient_clipping(cfg, optimizer)
@classmethod
def build_test_loader(cls, cfg: CfgNode, dataset_name):
return build_detection_test_loader(cfg, dataset_name, mapper=DatasetMapper(cfg, False))
@classmethod
def build_train_loader(cls, cfg: CfgNode):
data_loader = build_detection_train_loader(cfg, mapper=DatasetMapper(cfg, True))
if not has_inference_based_loaders(cfg):
return data_loader
model = cls.build_model(cfg)
model.to(cfg.BOOTSTRAP_MODEL.DEVICE)
DetectionCheckpointer(model).resume_or_load(cfg.BOOTSTRAP_MODEL.WEIGHTS, resume=False)
inference_based_loaders, ratios = build_inference_based_loaders(cfg, model)
loaders = [data_loader] + inference_based_loaders
ratios = [1.0] + ratios
combined_data_loader = build_combined_loader(cfg, loaders, ratios)
sample_counting_loader = SampleCountingLoader(combined_data_loader)
return sample_counting_loader
def build_writers(self):
writers = super().build_writers()
writers.append(SampleCountMetricPrinter())
return writers
@classmethod
def test_with_TTA(cls, cfg: CfgNode, model):
logger = logging.getLogger("detectron2.trainer")
# In the end of training, run an evaluation with TTA
# Only support some R-CNN models.
logger.info("Running inference with test-time augmentation ...")
transform_data = load_from_cfg(cfg)
model = DensePoseGeneralizedRCNNWithTTA(
cfg, model, transform_data, DensePoseDatasetMapperTTA(cfg)
)
evaluators = [
cls.build_evaluator(
cfg, name, output_folder=os.path.join(cfg.OUTPUT_DIR, "inference_TTA")
)
for name in cfg.DATASETS.TEST
]
res = cls.test(cfg, model, evaluators) # pyre-ignore[6]
res = OrderedDict({k + "_TTA": v for k, v in res.items()})
return res
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