Caffe2 - Python API
A deep learning, cross platform ML framework
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caffe2.python.dataio.Reader Class Reference
Inheritance diagram for caffe2.python.dataio.Reader:
caffe2.python.cached_reader.CachedReader caffe2.python.dataio.CounterReader caffe2.python.dataio.ReaderWithLimitBase caffe2.python.dataset._DatasetRandomReader caffe2.python.dataset._DatasetReader caffe2.python.pipeline.ProcessingReader caffe2.python.queue_util._QueueReader caffe2.python.record_queue._QueueReader caffe2.python.text_file_reader.TextFileReader

Public Member Functions

def __init__ (self, schema=None)
def schema (self)
def setup_ex (self, init_net, finish_net)
def read_ex (self, local_init_net, local_finish_net)
def read_record_ex (self, local_init_net, local_finish_net)
def read (self, read_net)
def reset (self, net)
def read_record (self, read_net)
def execution_step (self, reader_net_name=None, external_should_stop=None)

Detailed Description

Reader is an abstract class to be implemented in order to provide
operations capable of iterating through a dataset or stream of data.

A Reader must implement at least one operation, `read`, which
adds operations to a net that read the next batch of data. Readers can
optionally support the `reset` operation, which is useful when multiple
passes over the data are required.

Definition at line 43 of file

Member Function Documentation

def caffe2.python.dataio.Reader.execution_step (   self,
  reader_net_name = None,
  external_should_stop = None 
Create an execution step with a net containing read operators.

The execution step will contain a `stop_blob` that knows how to stop
the execution loop when end of data was reached.


    read_step, fields = reader.execution_step()
    consume_net = core.Net('consume')
    consume_net.Print(fields[0], [])
    p = core.Plan('reader')

    reader_net_name: (optional) the name of the reader_net to be
             created. The execution step will
             be named accordingly.

    A tuple (read_step, fields), with:
read_step: A newly created execution step containing a net with
           read operations. The step will have `stop_blob` set,
           in order to stop the loop on end of data.
fields: A tuple of BlobReference containing the latest batch
        of data that was read.

Definition at line 121 of file

def (   self,
Append operations to read_net that will read a batch from the
underlying data soruce.

Operations added to `read_net` must be thread safe and atomic, that is,
it should be possible to clone `read_net` and run multiple instances of
it in parallel.

    read_net: the net that will be appended with read operations

    A tuple (should_stop, fields), with:
should_stop: BlobReference pointing to a boolean scalar
    blob that indicates whether the read operation
    was succesfull or whether the end of data has
    been reached.
fields: A tuple of BlobReference containing the latest batch
    of data that was read.

Definition at line 85 of file

def caffe2.python.dataio.Reader.reset (   self,
Append operations to `net` that will reset the reader.

This can be used to read the data multiple times.
Not all readers support this operation.

Definition at line 107 of file

def caffe2.python.dataio.Reader.setup_ex (   self,
Setup nets to run at task initialization and cleanup time.

    global_init_net: A net invoked at task init time.
    global_finish_net: A net invoked at task cleanup time.

Definition at line 65 of file

The documentation for this class was generated from the following file: