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# SPDX-FileCopyrightText: Copyright (c) 1993-2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
# SPDX-License-Identifier: Apache-2.0
#
# 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 argparse
import errno
import hashlib
import logging
import os
import sys
logger = logging.getLogger("downloader")
class DataFile:
"""Holder of a data file."""
def __init__(self, attr):
self.attr = attr
self.path = attr["path"]
self.url = attr["url"]
if "checksum" not in attr:
logger.warning("Checksum of %s not provided!", self.path)
self.checksum = attr.get("checksum", None)
def __str__(self):
return str(self.attr)
class SampleData:
"""Holder of data files of an sample."""
def __init__(self, attr):
self.attr = attr
self.sample = attr["sample"]
files = attr.get("files", [])
self.files = [DataFile(f) for f in files]
def __str__(self):
return str(self.attr)
def _loadYAML(yaml_path):
with open(yaml_path, "rb") as f:
import yaml
y = yaml.load(f, yaml.FullLoader)
return SampleData(y)
def _checkMD5(path, refMD5):
md5 = hashlib.md5(open(path, "rb").read()).hexdigest()
return md5 == refMD5
def _createDirIfNeeded(path):
the_dir = os.path.dirname(path)
try:
os.makedirs(the_dir)
except OSError as e:
if e.errno != errno.EEXIST:
raise
def download(data_dir, yaml_path, retries, overwrite=False):
"""Download the data files specified in YAML file to a directory.
Return false if the downloaded file or the local copy (if not overwrite) has a different checksum.
"""
sample_data = _loadYAML(yaml_path)
logger.info("Downloading data for %s", sample_data.sample)
def _downloadFile(path, url, retries):
logger.info("Downloading %s from %s", path, url)
import requests
from requests.adapters import HTTPAdapter, Retry
session = requests.Session()
retries = Retry(total=retries, backoff_factor=0.5)
session.mount("http://", HTTPAdapter(max_retries=retries))
session.mount("https://", HTTPAdapter(max_retries=retries))
try:
r = session.get(url, stream=True, timeout=60)
if r.status_code == 200:
logger.info("Connecting to %s is successful.", url)
size = int(r.headers.get("content-length", 0))
from tqdm import tqdm
progress_bar = tqdm(total=size, unit="iB", unit_scale=True)
with open(path, "wb") as fd:
for chunk in r.iter_content(chunk_size=1024):
progress_bar.update(len(chunk))
fd.write(chunk)
progress_bar.close()
return True
else:
logger.info("Failed to connect to %s with status code: %s.", url, r.status_code)
return False
except requests.exceptions.ConnectionError as e:
logger.debug("Connection failed after retries:", e)
except requests.exceptions.Timeout as e:
logger.debug("A timeout occurred:", e)
except requests.exceptions.RequestException as e:
logger.debug("Error occurred while requesting connection to %s: %s.", url, e)
return False
allGood = True
for f in sample_data.files:
fpath = os.path.join(data_dir, f.path)
if os.path.exists(fpath):
if _checkMD5(fpath, f.checksum):
logger.info("Found local copy %s, skip downloading.", fpath)
continue
else:
logger.warning("Local copy %s has a different checksum!", fpath)
if overwrite:
logging.warning("Removing local copy %s", fpath)
os.remove(fpath)
else:
allGood = False
continue
_createDirIfNeeded(fpath)
assert _downloadFile(fpath, f.url, retries=retries)
if not _checkMD5(fpath, f.checksum):
logger.error("The downloaded file %s has a different checksum!", fpath)
allGood = False
return allGood
def _parseArgs():
parser = argparse.ArgumentParser(description="Downloader of TensorRT sample data files.")
parser.add_argument(
"-d",
"--data",
help="Specify the data directory, data will be downloaded to there. $TRT_DATA_DIR will be overwritten by this argument.",
)
parser.add_argument(
"-f",
"--file",
help="Specify the path to the download.yml, default to `download.yml` in the working directory",
default="download.yml",
)
parser.add_argument(
"-o",
"--overwrite",
help="Force to overwrite if MD5 check failed",
action="store_true",
default=False,
)
parser.add_argument(
"-v",
"--verify",
help="Verify if the data has been downloaded. Will not download if specified.",
action="store_true",
default=False,
)
parser.add_argument(
"-r",
"--retries",
help="Number of retries for download",
type=int,
default=10,
)
args, _ = parser.parse_known_args()
data = os.environ.get("TRT_DATA_DIR", None) if args.data is None else args.data
if data is None:
raise ValueError("Data directory must be specified by either `-d $DATA` or environment variable $TRT_DATA_DIR.")
return data, args
def verifyChecksum(data_dir, yaml_path):
"""Verify the checksum of the files described by the YAML.
Return false of any of the file doesn't existed or checksum is different with the YAML.
"""
sample_data = _loadYAML(yaml_path)
logger.info("Verifying data files and their MD5 for %s", sample_data.sample)
allGood = True
for f in sample_data.files:
fpath = os.path.join(data_dir, f.path)
if os.path.exists(fpath):
if _checkMD5(fpath, f.checksum):
logger.info("MD5 match for local copy %s", fpath)
else:
logger.error("Local file %s has a different checksum!", fpath)
allGood = False
else:
allGood = False
logger.error("Data file %s doesn't have a local copy", f.path)
return allGood
def main():
data, args = _parseArgs()
logging.basicConfig()
logger.setLevel(logging.INFO)
ret = True
if args.verify:
ret = verifyChecksum(data, args.file)
else:
ret = download(data, args.file, args.retries, args.overwrite)
if not ret:
# Error of downloading or checksum
sys.exit(1)
if __name__ == "__main__":
main()
TRT_DATA_DIR = None
def getFilePath(path):
"""Util to get the full path to the downloaded data files.
It only works when the sample doesn't have any other command line argument.
"""
global TRT_DATA_DIR
if not TRT_DATA_DIR:
parser = argparse.ArgumentParser(description="Helper of data file download tool")
parser.add_argument(
"-d",
"--data",
help="Specify the data directory where it is saved in. $TRT_DATA_DIR will be overwritten by this argument.",
)
args, _ = parser.parse_known_args()
TRT_DATA_DIR = os.environ.get("TRT_DATA_DIR", None) if args.data is None else args.data
if TRT_DATA_DIR is None:
raise ValueError("Data directory must be specified by either `-d $DATA` or environment variable $TRT_DATA_DIR.")
fullpath = os.path.join(TRT_DATA_DIR, path)
if not os.path.exists(fullpath):
raise ValueError("Data file %s doesn't exist!" % fullpath)
return fullpath
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