forked from huawei/mindspore2022
109 lines
3.3 KiB
Python
109 lines
3.3 KiB
Python
# Copyright 2019 Huawei Technologies Co., Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# ==============================================================================
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"""
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This module is to read data from mindrecord.
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"""
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import mindspore._c_mindrecord as ms
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from mindspore import log as logger
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from .common.exceptions import MRMOpenError, MRMLaunchError
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__all__ = ['ShardReader']
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class ShardReader:
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"""
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Wrapper class which is represent ShardReader class in c++ module.
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The class would read a batch of data from MindRecord File series.
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"""
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def __init__(self):
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self._reader = ms.ShardReader()
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def open(self, file_name, num_consumer=4, columns=None, operator=None):
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"""
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Open file and prepare to read MindRecord File.
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Args:
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file_name (str, list[str]): File names of MindRecord File.
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num_consumer (int): Number of worker threads which load data in parallel. Default: 4.
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columns (list[str]): List of fields which correspond data would be read.
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operator(int): Reserved parameter for operators. Default: None.
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Returns:
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MSRStatus, SUCCESS or FAILED.
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Raises:
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MRMOpenError: If failed to open MindRecord File.
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"""
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columns = columns if columns else []
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operator = operator if operator else []
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if isinstance(file_name, list):
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load_dataset = False
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else:
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load_dataset = True
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file_name = [file_name]
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ret = self._reader.open(file_name, load_dataset, num_consumer, columns, operator)
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if ret != ms.MSRStatus.SUCCESS:
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logger.error("Failed to open {}.".format(file_name))
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self.close()
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raise MRMOpenError
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return ret
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def launch(self):
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"""
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Launch the worker threads to load data.
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Returns:
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MSRStatus, SUCCESS or FAILED.
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Raises:
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MRMLaunchError: If failed to launch worker threads.
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"""
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ret = self._reader.launch()
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if ret != ms.MSRStatus.SUCCESS:
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logger.error("Failed to launch worker threads.")
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raise MRMLaunchError
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return ret
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def get_next(self):
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"""
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Return a batch of data including blob data and raw data.
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Returns:
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list of dict.
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"""
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return self._reader.get_next()
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def get_blob_fields(self):
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"""
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Return blob fields of MindRecord.
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Returns:
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list of str.
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"""
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return self._reader.get_blob_fields()
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def get_header(self):
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"""
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Return header of MindRecord.
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Returns:
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pointer object refer to header.
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"""
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return self._reader.get_header()
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def close(self):
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"""close MindRecord File."""
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self._reader.close()
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