mxnet.recordio.MXIndexedRecordIO¶

class mxnet.recordio.MXIndexedRecordIO(idx_path, uri, flag, key_type=<class 'int'>)[source]¶

Reads/writes RecordIO data format, supporting random access.

Examples

>>> for i in range(5):
...     record.write_idx(i, 'record_%d'%i)
>>> record.close()
>>> record = mx.recordio.MXIndexedRecordIO('tmp.idx', 'tmp.rec', 'r')
>>> record.read_idx(3)
record_3

Parameters

idx_path (str) – Path to the index file.
uri (str) – Path to the record file. Only supports seekable file types.
flag (str) – ‘w’ for write or ‘r’ for read.
key_type (type) – Data type for keys.

__init__(idx_path, uri, flag, key_type=<class 'int'>)[source]¶: Initialize self. See help(type(self)) for accurate signature.

Methods

`__init__`(idx_path, uri, flag[, key_type])	Initialize self.
`close`()	Closes the record file.
`open`()	Opens the record file.
`read`()	Returns record as a string.
`read_idx`(idx)	Returns the record at given index.
`reset`()	Resets the pointer to first item.
`seek`(idx)	Sets the current read pointer position.
`tell`()	Returns the current position of write head.
`write`(buf)	Inserts a string buffer as a record.
`write_idx`(idx, buf)	Inserts input record at given index.