Source code for

# Copyright 2019 Huawei Technologies Co., Ltd
# 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
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# See the License for the specific language governing permissions and
# limitations under the License.
# ==============================================================================
Imagenet convert tool for MindRecord.
import os
import time

from mindspore import log as logger
from ..common.exceptions import PathNotExistsError
from ..filewriter import FileWriter
from ..shardutils import check_filename

__all__ = ['ImageNetToMR']

[docs]class ImageNetToMR: """ Class is for transformation from imagenet to MindRecord. Args: map_file (str): the map file which indicate label. the map file content should like this: .. code-block:: n02119789 1 pen n02100735 2 notebook n02110185 3 mouse n02096294 4 orange image_dir (str): image directory contains n02119789, n02100735, n02110185, n02096294 dir. destination (str): the MindRecord file path to transform into. partition_number (int, optional): partition size (default=1). Raises: ValueError: If map_file, image_dir or destination is invalid. """ def __init__(self, map_file, image_dir, destination, partition_number=1): check_filename(map_file) self.map_file = map_file check_filename(image_dir) self.image_dir = image_dir check_filename(destination) self.destination = destination if partition_number is not None: if not isinstance(partition_number, int): raise ValueError("The parameter partition_number must be int") self.partition_number = partition_number else: raise ValueError("The parameter partition_number must be int") self.writer = FileWriter(self.destination, self.partition_number) def _get_imagenet_as_dict(self): """ Get data from imagenet as dict. Yields: data (dict of list): imagenet data list which contains dict. """ if not os.path.exists(self.map_file): raise IOError("map file {} not exists".format(self.map_file)) label_dict = {} with open(self.map_file) as fp: line = fp.readline() while line: labels = line.split(" ") label_dict[labels[1]] = labels[0] line = fp.readline() # get all the dir which are n02087046, n02094114, n02109525 dir_paths = {} for item in label_dict: real_path = os.path.join(self.image_dir, label_dict[item]) if not os.path.isdir(real_path): logger.warning("{} dir is not exist".format(real_path)) continue dir_paths[item] = real_path if not dir_paths: raise PathNotExistsError("not valid image dir in {}".format(self.image_dir)) # get the filename, label and image binary as a dict for label in dir_paths: for item in os.listdir(dir_paths[label]): file_name = os.path.join(dir_paths[label], item) if not item.endswith("JPEG") and not item.endswith("jpg"): logger.warning("{} file is not suffix with JPEG/jpg, skip it.".format(file_name)) continue data = {} data["file_name"] = str(file_name) data["label"] = int(label) # get the image data image_file = open(file_name, "rb") image_bytes = image_file.close() if not image_bytes: logger.warning("The image file: {} is invalid.".format(file_name)) continue data["data"] = image_bytes yield data
[docs] def transform(self): """ Executes transformation from imagenet to MindRecord. Returns: SUCCESS/FAILED, whether successfully written into MindRecord. """ t0_total = time.time() imagenet_schema_json = {"label": {"type": "int64"}, "data": {"type": "bytes"}, "file_name": {"type": "string"}}"transformed MindRecord schema is: {}".format(imagenet_schema_json)) # set the header size self.writer.set_header_size(1<<24) # set the page size self.writer.set_page_size(1<<26) # create the schema self.writer.add_schema(imagenet_schema_json, "imagenet_schema") # add the index self.writer.add_index(["label", "file_name"]) imagenet_iter = self._get_imagenet_as_dict() batch_size = 256 transform_count = 0 while True: data_list = [] try: for _ in range(batch_size): data_list.append(imagenet_iter.__next__()) transform_count += 1 self.writer.write_raw_data(data_list)"transformed {} record...".format(transform_count)) except StopIteration: if data_list: self.writer.write_raw_data(data_list)"transformed {} record...".format(transform_count)) break ret = self.writer.commit() t1_total = time.time()"--------------------------------------------")"END. Total time: {}".format(t1_total - t0_total))"--------------------------------------------") return ret