# Copyright (c) 2018-2019, NVIDIA CORPORATION. All rights reserved.

#

# Licensed under the Apache License, Version 2.0 (the "License");

# you may not use this file except in compliance with the License.

# You may obtain a copy of the License at

#

# http://www.apache.org/licenses/LICENSE-2.0

#

# Unless required by applicable law or agreed to in writing, software

# distributed under the License is distributed on an "AS IS" BASIS,

# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

# See the License for the specific language governing permissions and

# limitations under the License.

import os

import torch

from torch.utils.data import DataLoader

from src.utils import dboxes300_coco, COCODetection

from src.utils import SSDTransformer

from src.coco import COCO

#DALI import

from src.coco_pipeline import COCOPipeline, DALICOCOIterator

def get_train_loader(args, local_seed):

train_annotate = os.path.join(args.data, "annotations/instances_train2017.json")

train_coco_root = os.path.join(args.data, "train2017")

train_pipe = COCOPipeline(args.batch_size, args.local_rank, train_coco_root,

train_annotate, args.N_gpu, num_threads=args.num_workers,

output_fp16=args.amp, output_nhwc=False,

pad_output=False, seed=local_seed)

train_pipe.build()

test_run = train_pipe.schedule_run(), train_pipe.share_outputs(), train_pipe.release_outputs()

train_loader = DALICOCOIterator(train_pipe, 118287 / args.N_gpu)

return train_loader

def get_val_dataset(args):

dboxes = dboxes300_coco()

val_trans = SSDTransformer(dboxes, (300, 300), val=True)

val_annotate = os.path.join(args.data, "annotations/instances_val2017.json")

val_coco_root = os.path.join(args.data, "val2017")

val_coco = COCODetection(val_coco_root, val_annotate, val_trans)

return val_coco

def get_val_dataloader(dataset, args):

if args.distributed:

val_sampler = torch.utils.data.distributed.DistributedSampler(dataset)

else:

val_sampler = None

val_dataloader = DataLoader(dataset,

batch_size=args.eval_batch_size,

shuffle=False, # Note: distributed sampler is shuffled :(

sampler=val_sampler,

num_workers=args.num_workers)

return val_dataloader

def get_coco_ground_truth(args):

val_annotate = os.path.join(args.data, "annotations/instances_val2017.json")

cocoGt = COCO(annotation_file=val_annotate)

return cocoGt