mirror of
https://github.com/saymrwulf/pytorch.git
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4cd263db74
Summary: Allows to collect samples over multiple batches. The method uses a circular array and so there is no guarantee about the order of the samples. The goal is to get a view of the data accross multiple batches Reviewed By: salexspb Differential Revision: D4216181 fbshipit-source-id: bb9e1fa84ac7e04006dcddb53c9347a42ec83dc8
416 lines
16 KiB
Python
416 lines
16 KiB
Python
from __future__ import absolute_import
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from __future__ import division
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from __future__ import print_function
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from __future__ import unicode_literals
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import numpy as np
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from caffe2.python import core, workspace, dataset
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from caffe2.python.dataset import Const
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from caffe2.python.schema import (
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List, Field, Struct, Scalar, Map,
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from_blob_list, FetchRecord, NewRecord, FeedRecord)
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from caffe2.python.test_util import TestCase
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def _assert_arrays_equal(actual, ref, err_msg):
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if ref.dtype.kind in ('S', 'O'):
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np.testing.assert_array_equal(actual, ref, err_msg=err_msg)
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else:
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np.testing.assert_allclose(
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actual, ref, atol=1e-4, rtol=1e-4, err_msg=err_msg)
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def _assert_records_equal(actual, ref):
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assert isinstance(actual, Field)
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assert isinstance(ref, Field)
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b1 = actual.field_blobs()
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b2 = ref.field_blobs()
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assert(len(b1) == len(b2)), 'Records have different lengths: %d vs. %d' % (
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len(b1), len(b2))
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for name, d1, d2 in zip(ref.field_names(), b1, b2):
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_assert_arrays_equal(d1, d2, err_msg='Mismatch in field %s.' % name)
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class TestDatasetOps(TestCase):
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def test_dataset_ops(self):
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"""
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1. Defining the schema of our dataset.
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This example schema could represent, for example, a search query log.
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"""
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schema = Struct(
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# fixed size vector, which will be stored as a matrix when batched
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('dense', Scalar((np.float32, 3))),
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# could represent a feature map from feature ID to float value
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('floats', Map(
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Scalar(np.int32),
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Scalar(np.float32))),
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# could represent a multi-valued categorical feature map
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('int_lists', Map(
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Scalar(np.int32),
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List(Scalar(np.int64)),
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)),
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# could represent a multi-valued, weighted categorical feature map
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('id_score_pairs', Map(
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Scalar(np.int32),
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Map(
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Scalar(np.int64),
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Scalar(np.float32),
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keys_name='ids',
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values_name='scores'),
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)),
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# additional scalar information
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('metadata', Struct(
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('user_id', Scalar(np.int64)),
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('user_embed', Scalar((np.float32, 2))),
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('query', Scalar(str)),
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)),
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)
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"""
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This is what the flattened fields for this schema look like, along
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with its type. Each one of these fields will be stored, read and
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writen as a tensor.
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"""
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expected_fields = [
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('dense', (np.float32, 3)),
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('floats:lengths', np.int32),
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('floats:values:keys', np.int32),
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('floats:values:values', np.float32),
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('int_lists:lengths', np.int32),
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('int_lists:values:keys', np.int32),
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('int_lists:values:values:lengths', np.int32),
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('int_lists:values:values:values', np.int64),
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('id_score_pairs:lengths', np.int32),
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('id_score_pairs:values:keys', np.int32),
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('id_score_pairs:values:values:lengths', np.int32),
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('id_score_pairs:values:values:values:ids', np.int64),
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('id_score_pairs:values:values:values:scores', np.float32),
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('metadata:user_id', np.int64),
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('metadata:user_embed', (np.float32, 2)),
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('metadata:query', str),
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]
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zipped = zip(
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expected_fields,
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schema.field_names(),
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schema.field_types())
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for (ref_name, ref_type), name, dtype in zipped:
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self.assertEquals(ref_name, name)
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self.assertEquals(np.dtype(ref_type), dtype)
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"""
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2. The contents of our dataset.
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Contents as defined below could represent, for example, a log of
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search queries along with dense, sparse features and metadata.
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The datset below has 3 top-level entries.
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"""
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contents_raw = [
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# dense
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[[1.1, 1.2, 1.3], [2.1, 2.2, 2.3], [3.1, 3.2, 3.3]],
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# floats
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[1, 2, 3], # len
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[11, 21, 22, 31, 32, 33], # key
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[1.1, 2.1, 2.2, 3.1, 3.2, 3.3], # value
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# int lists
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[2, 0, 1], # len
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[11, 12, 31], # key
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[2, 4, 3], # value:len
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[111, 112, 121, 122, 123, 124, 311, 312, 313], # value:value
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# id score pairs
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[1, 2, 2], # len
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[11, 21, 22, 31, 32], # key
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[1, 1, 2, 2, 3], # value:len
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[111, 211, 221, 222, 311, 312, 321, 322, 323], # value:ids
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[11.1, 21.1, 22.1, 22.2, 31.1, 31.2, 32.1, 32.2, 32.3], # val:score
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# metadata
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[123, 234, 456], # user_id
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[[0.2, 0.8], [0.5, 0.5], [0.7, 0.3]], # user_embed
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['dog posts', 'friends who like to', 'posts about ca'], # query
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]
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# convert the above content to ndarrays, checking against the schema
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contents = from_blob_list(schema, contents_raw)
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"""
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3. Creating and appending to the dataset.
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We first create an empty dataset with the given schema.
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Then, a Writer is used to append these entries to the dataset.
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"""
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ds = dataset.Dataset(schema)
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net = core.Net('init')
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ds.init_empty(net)
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content_blobs = NewRecord(net, contents)
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FeedRecord(content_blobs, contents)
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writer = ds.writer(init_net=net)
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writer.write_record(net, content_blobs)
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workspace.RunNetOnce(net)
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"""
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4. Iterating through the dataset contents.
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If we were to iterate through the top level entries of our dataset,
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this is what we should expect to see:
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"""
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entries_raw = [
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(
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[[1.1, 1.2, 1.3]], # dense
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[1], [11], [1.1], # floats
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[2], [11, 12], [2, 4], [111, 112, 121, 122, 123, 124], # intlst
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[1], [11], [1], [111], [11.1], # id score pairs
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[123], [[0.2, 0.8]], ['dog posts'], # metadata
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),
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(
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[[2.1, 2.2, 2.3]], # dense
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[2], [21, 22], [2.1, 2.2], # floats
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[0], [], [], [], # int list
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[2], [21, 22], [1, 2], [211, 221, 222], [21.1, 22.1, 22.2],
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[234], [[0.5, 0.5]], ['friends who like to'], # metadata
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),
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(
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[[3.1, 3.2, 3.3]], # dense
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[3], [31, 32, 33], [3.1, 3.2, 3.3], # floats
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[1], [31], [3], [311, 312, 313], # int lst
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[2], [31, 32], [2, 3], [311, 312, 321, 322, 323],
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[31.1, 31.2, 32.1, 32.2, 32.3], # id score list
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[456], [[0.7, 0.3]], ['posts about ca'], # metadata
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),
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# after the end of the dataset, we will keep getting empty vectors
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([],) * 16,
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([],) * 16,
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]
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entries = [from_blob_list(schema, e) for e in entries_raw]
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"""
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Let's go ahead and create the reading nets.
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We will run `read` net multiple times and assert that we are reading the
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entries the way we stated above.
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"""
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read_init_net = core.Net('read_init')
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read_next_net = core.Net('read_next')
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reader = ds.reader(read_init_net)
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should_continue, batch = reader.read_record(read_next_net)
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workspace.RunNetOnce(read_init_net)
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workspace.CreateNet(read_next_net)
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for i, entry in enumerate(entries):
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workspace.RunNet(str(read_next_net))
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actual = FetchRecord(batch)
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_assert_records_equal(actual, entry)
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"""
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5. Reading/writing in a single plan
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If all of operations on the data are expressible as Caffe2 operators,
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we don't need to load the data to python, iterating through the dataset
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in a single Plan.
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Where we will process the dataset a little and store it in a second
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dataset. We can reuse the same Reader since it supports reset.
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"""
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reset_net = core.Net('reset_net')
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reader.reset(reset_net)
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read_step, batch = reader.execution_step()
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""" We will add the line number * 1000 to the feature ids. """
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process_net = core.Net('process')
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line_no = Const(process_net, 0, dtype=np.int32)
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const_one = Const(process_net, 1000, dtype=np.int32)
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process_net.Add([line_no, const_one], [line_no])
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field = batch.floats.keys.get()
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process_net.Print(field, [])
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process_net.Add([field, line_no], field, broadcast=1, axis=0)
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""" Lets create a second dataset and append to it. """
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ds2 = dataset.Dataset(schema, name='dataset2')
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ds2.init_empty(reset_net)
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writer = ds2.writer(reset_net)
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writer.write_record(process_net, batch)
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# commit is not necessary for DatasetWriter but will add it for
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# generality of the example
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commit_net = core.Net('commit')
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writer.commit(commit_net)
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""" Time to create and run a plan which will do the processing """
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plan = core.Plan('process')
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plan.AddStep(core.execution_step('reset', reset_net))
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plan.AddStep(read_step.AddNet(process_net))
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plan.AddStep(core.execution_step('commit', commit_net))
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workspace.RunPlan(plan)
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"""
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Now we should have dataset2 populated.
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"""
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ds2_data = FetchRecord(ds2.content())
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field = ds2_data.floats.keys
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field.set(blob=field.get() - [1000, 2000, 2000, 3000, 3000, 3000])
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_assert_records_equal(contents, ds2_data)
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"""
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6. Slicing a dataset
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You can create a new schema from pieces of another schema and reuse
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the same data.
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"""
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subschema = Struct(('top_level', schema.int_lists.values))
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int_list_contents = contents.int_lists.values.field_names()
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self.assertEquals(len(subschema.field_names()), len(int_list_contents))
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"""
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7. Random Access a dataset
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"""
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read_init_net = core.Net('read_init')
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read_next_net = core.Net('read_next')
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idx = np.array([2, 1, 0])
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indices_blob = Const(read_init_net, idx, name='indices')
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reader = ds.random_reader(read_init_net, indices_blob)
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reader.computeoffset(read_init_net)
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should_continue, batch = reader.read_record(read_next_net)
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workspace.CreateNet(read_init_net)
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workspace.RunNetOnce(read_init_net)
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workspace.CreateNet(read_next_net)
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read_next_net_name = str(read_next_net)
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for i in range(len(entries)):
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k = idx[i] if i in idx else i
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entry = entries[k]
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workspace.RunNet(str(read_next_net))
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actual = FetchRecord(batch)
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_assert_records_equal(actual, entry)
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"""
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8. Sort and shuffle a dataset
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This sort the dataset using the score of a certain column,
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and then shuffle within each chunk of size batch_size * shuffle_size
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before shuffling the chunks.
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"""
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read_init_net = core.Net('read_init')
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read_next_net = core.Net('read_next')
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reader = ds.random_reader(read_init_net)
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reader.sort_and_shuffle(read_init_net, 'int_lists:lengths', 1, 2)
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reader.computeoffset(read_init_net)
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should_continue, batch = reader.read_record(read_next_net)
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workspace.CreateNet(read_init_net)
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workspace.RunNetOnce(read_init_net)
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workspace.CreateNet(read_next_net)
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expected_idx = np.array([2, 1, 0])
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for i in range(len(entries)):
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k = expected_idx[i] if i in expected_idx else i
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entry = entries[k]
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workspace.RunNet(str(read_next_net))
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actual = FetchRecord(batch)
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_assert_records_equal(actual, entry)
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def test_last_n_window_ops(self):
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collect_net = core.Net('collect_net')
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collect_net.GivenTensorFill(
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[],
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'input',
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shape=[3, 2],
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values=[1.0, 2.0, 3.0, 4.0, 5.0, 6.0],
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)
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collect_net.LastNWindowCollector(
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['input'],
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['output'],
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num_to_collect=7,
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)
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plan = core.Plan('collect_data')
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plan.AddStep(core.execution_step('collect_data',
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[collect_net], num_iter=1))
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workspace.RunPlan(plan)
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reference_result = workspace.FetchBlob('output')
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self.assertSequenceEqual(
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[item for sublist in reference_result for item in sublist],
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[1, 2, 3, 4, 5, 6])
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plan = core.Plan('collect_data')
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plan.AddStep(core.execution_step('collect_data',
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[collect_net], num_iter=2))
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workspace.RunPlan(plan)
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reference_result = workspace.FetchBlob('output')
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self.assertSequenceEqual(
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[item for sublist in reference_result for item in sublist],
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[1, 2, 3, 4, 5, 6, 1, 2, 3, 4, 5, 6])
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plan = core.Plan('collect_data')
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plan.AddStep(core.execution_step('collect_data',
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[collect_net], num_iter=3))
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workspace.RunPlan(plan)
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reference_result = workspace.FetchBlob('output')
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self.assertSequenceEqual(
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[item for sublist in reference_result for item in sublist],
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[3, 4, 5, 6, 5, 6, 1, 2, 3, 4, 5, 6, 1, 2])
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def test_collect_tensor_ops(self):
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init_net = core.Net('init_net')
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blobs = ['blob_1', 'blob_2', 'blob_3']
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bvec_map = {}
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ONE = init_net.ConstantFill([], 'ONE', shape=[1, 2], value=1)
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for b in blobs:
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init_net.ConstantFill([], [b], shape=[1, 2], value=0)
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bvec_map[b] = b + '_vec'
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init_net.CreateTensorVector([], [bvec_map[b]])
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reader_net = core.Net('reader_net')
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for b in blobs:
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reader_net.Add([b, ONE], [b])
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collect_net = core.Net('collect_net')
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num_to_collect = 1000
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max_example_to_cover = 100000
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bvec = [bvec_map[b] for b in blobs]
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collect_net.CollectTensor(
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bvec + blobs,
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bvec,
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num_to_collect=num_to_collect,
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)
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print('Collect Net Proto: {}'.format(collect_net.Proto()))
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plan = core.Plan('collect_data')
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plan.AddStep(core.execution_step('collect_init', init_net))
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plan.AddStep(core.execution_step('collect_data',
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[reader_net, collect_net],
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num_iter=max_example_to_cover))
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workspace.RunPlan(plan)
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# concat the collected tensors
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concat_net = core.Net('concat_net')
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bconcated_map = {}
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for b in blobs:
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bconcated_map[b] = b + '_concated'
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concat_net.ConcatTensorVector([bvec_map[b]], [bconcated_map[b]])
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workspace.RunNetOnce(concat_net)
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# check data
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reference_result = workspace.FetchBlob(bconcated_map[blobs[0]])
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self.assertEqual(reference_result.shape,
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(min(num_to_collect, max_example_to_cover), 2))
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hist, _ = np.histogram(reference_result[:, 0], bins=10,
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range=(1, max_example_to_cover))
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print('Sample histogram: {}'.format(hist))
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self.assertTrue(all(hist > 0.7 * (num_to_collect / 10)))
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for i in range(1, len(blobs)):
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result = workspace.FetchBlob(bconcated_map[blobs[i]])
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self.assertEqual(reference_result.tolist(), result.tolist())
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if __name__ == "__main__":
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import unittest
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unittest.main()
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