tf.TFRecordReader.read_up_to(queue, num_records, name=None)
Returns up to num_records (key, value pairs) produced by a reader.
Will dequeue a work unit from queue if necessary (e.g., when the Reader needs to start reading from a new file since it has finished with the previous file). It may return less than num_records even before the last batch.
Args:
queue: A Queue or a mutable string Tensor representing a handle to a Queue, with string work items.
num_records: Number of records to read.