support custom reader in ppdet.data (#2965)

ppdet/data/data_feed.py

@@ -42,14 +42,7 @@ __all__ = [
 ]
 
 
-def create_reader(feed, max_iter=0, args_path=None):
-    """
-    Return iterable data reader.
-
-    Args:
-        max_iter (int): number of iterations.
-    """
-
+def _prepare_data_config(feed, args_path):
     # if `DATASET_DIR` does not exists, search ~/.paddle/dataset for a directory
     # named `DATASET_DIR` (e.g., coco, pascal), if not present either, download
     dataset_home = args_path if args_path else feed.dataset.dataset_dir
@@ -72,9 +65,7 @@ def create_reader(feed, max_iter=0, args_path=None):
     if getattr(feed, 'use_process', None) is not None:
         use_process = feed.use_process
 
-    mode = feed.mode
     data_config = {
-        mode: {
         'ANNO_FILE': feed.dataset.annotation,
         'IMAGE_DIR': feed.dataset.image_dir,
         'USE_DEFAULT_LABEL': feed.dataset.use_default_label,
@@ -84,10 +75,26 @@ def create_reader(feed, max_iter=0, args_path=None):
         'MIXUP_EPOCH': mixup_epoch,
         'TYPE': type(feed.dataset).__source__
     }
-    }
 
     if len(getattr(feed.dataset, 'images', [])) > 0:
-        data_config[mode]['IMAGES'] = feed.dataset.images
+        data_config['IMAGES'] = feed.dataset.images
+
+    return data_config
+
+
+def create_reader(feed, max_iter=0, args_path=None, my_source=None):
+    """
+    Return iterable data reader.
+
+    Args:
+        max_iter (int): number of iterations.
+        my_source (callable): callable function to create a source iterator
+            which is used to provide source data in 'ppdet.data.reader'
+    """
+
+    # if `DATASET_DIR` does not exists, search ~/.paddle/dataset for a directory
+    # named `DATASET_DIR` (e.g., coco, pascal), if not present either, download
+    data_config = _prepare_data_config(feed, args_path)
 
     transform_config = {
         'WORKER_CONF': {
@@ -130,8 +137,8 @@ def create_reader(feed, max_iter=0, args_path=None):
         ops.append(op_dict)
     transform_config['OPS'] = ops
 
-    reader = Reader(data_config, {mode: transform_config}, max_iter)
-    return reader._make_reader(mode)
+    return Reader.create(feed.mode, data_config,
+        transform_config, max_iter, my_source)
 
 
 # XXX batch transforms are only stubs for now, actually handled by `post_map`

ppdet/data/reader.py

@@ -40,14 +40,17 @@ class Reader(object):
         self._cname2cid = None
         assert isinstance(self._maxiter, Integral), "maxiter should be int"
 
-    def _make_reader(self, mode):
+    def _make_reader(self, mode, my_source=None):
         """Build reader for training or validation"""
+        if my_source is None:
             file_conf = self._data_cf[mode]
 
             # 1, Build data source
 
             sc_conf = {'data_cf': file_conf, 'cname2cid': self._cname2cid}
             sc = build_source(sc_conf)
+        else:
+            sc = my_source
 
         # 2, Buid a transformed dataset
         ops = self._trans_conf[mode]['OPS']
@@ -87,7 +90,7 @@ class Reader(object):
         if mode.lower() == 'train':
             if self._cname2cid is not None:
                 logger.warn('cname2cid already set, it will be overridden')
-            self._cname2cid = sc.cname2cid
+            self._cname2cid = getattr(sc, 'cname2cid', None)
 
         # 3, Build a reader
         maxit = -1 if self._maxiter <= 0 else self._maxiter
@@ -120,3 +123,15 @@ class Reader(object):
     def test(self):
         """Build reader for inference"""
         return self._make_reader('TEST')
+
+    @classmethod
+    def create(cls, mode, data_config,
+            transform_config, max_iter=-1,
+            my_source=None, ret_iter=True):
+        """ create a specific reader """
+        reader = Reader({mode: data_config},
+            {mode: transform_config}, max_iter)
+        if ret_iter:
+            return reader._make_reader(mode, my_source)
+        else:
+            return reader

ppdet/data/source/__init__.py

@@ -20,6 +20,7 @@ import copy
 
 from .roidb_source import RoiDbSource
 from .simple_source import SimpleSource
+from .iterator_source import IteratorSource
 
 
 def build_source(config):
@@ -40,11 +41,13 @@ def build_source(config):
         }
     """
     if 'data_cf' in config:
-        data_cf = {k.lower(): v for k, v in config['data_cf'].items()}
+        data_cf = config['data_cf']
         data_cf['cname2cid'] = config['cname2cid']
     else:
         data_cf = config
 
+    data_cf = {k.lower(): v for k, v in data_cf.items()}
+
     args = copy.deepcopy(data_cf)
     # defaut type is 'RoiDbSource'
     source_type = 'RoiDbSource'

ppdet/data/source/iterator_source.py

+# Copyright (c) 2019 PaddlePaddle Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+
+import os
+import numpy as np
+import copy
+
+import logging
+logger = logging.getLogger(__name__)
+
+from ..dataset import Dataset
+
+
+class IteratorSource(Dataset):
+    """
+    Load data samples from iterator in stream mode
+
+    Args:
+        iter_maker (callable): callable function to generate a iter
+        samples (int): number of samples to load, -1 means all
+    """
+
+    def __init__(self,
+                 iter_maker,
+                 samples=-1,
+                 **kwargs):
+        super(IteratorSource, self).__init__()
+        self._epoch = -1
+
+        self._iter_maker = iter_maker
+        self._data_iter = None
+        self._pos = -1
+        self._drained = False
+        self._samples = samples
+        self._sample_num = -1
+
+    def next(self):
+        if self._epoch < 0:
+            self.reset()
+
+        if self._data_iter is not None:
+            try:
+                sample = next(self._data_iter)
+                self._pos += 1
+                ret = sample
+            except StopIteration as e:
+                if self._sample_num <= 0:
+                    self._sample_num = self._pos
+                elif self._sample_num != self._pos:
+                    logger.info('num of loaded samples is different '
+                        'with previouse setting[prev:%d,now:%d]' % (self._sample_num, self._pos))
+                    self._sample_num = self._pos
+
+                self._data_iter = None
+                self._drained = True
+                raise e
+        else:
+            raise StopIteration("no more data in " + str(self))
+
+        if self._samples > 0 and self._pos >= self._samples:
+            self._data_iter = None
+            self._drained = True
+            raise StopIteration("no more data in " + str(self))
+        else:
+            return ret
+
+    def reset(self):
+        if self._data_iter is None:
+            self._data_iter = self._iter_maker()
+
+        if self._epoch < 0:
+            self._epoch = 0
+        else:
+            self._epoch += 1
+
+        self._pos = 0
+        self._drained = False
+
+    def size(self):
+        return self._sample_num
+
+    def drained(self):
+        assert self._epoch >= 0, "the first epoch has not started yet"
+        return self._pos >= self.size()
+
+    def epoch_id(self):
+        return self._epoch
+

ppdet/data/tests/run_all_tests.py

@@ -7,6 +7,7 @@ import unittest
 import test_loader
 import test_operator
 import test_roidb_source
+import test_iterator_source
 import test_transformer
 import test_reader
 
@@ -17,6 +18,7 @@ if __name__ == '__main__':
             test_loader.TestLoader,
             test_operator.TestBase,
             test_roidb_source.TestRoiDbSource,
+            test_iterator_source.TestIteratorSource,
             test_transformer.TestTransformer,
             test_reader.TestReader,
         ]

ppdet/data/tests/set_env.py

@@ -3,6 +3,9 @@ import os
 import six
 import logging
 
+import matplotlib
+matplotlib.use('Agg', force=False)
+
 prefix = os.path.dirname(os.path.abspath(__file__))
 
 #coco data for testing

ppdet/data/tests/test_iterator_source.py

+import os
+import time
+import unittest
+import sys
+import logging
+
+import set_env
+from ppdet.data.source import IteratorSource
+
+
+def _generate_iter_maker(num=10):
+    def _reader():
+        for i in range(num):
+            yield {'image': 'image_' + str(i), 'label': i}
+
+    return _reader
+
+class TestIteratorSource(unittest.TestCase):
+    """Test cases for dataset.source.roidb_source
+    """
+
+    @classmethod
+    def setUpClass(cls):
+        """ setup
+        """
+        pass
+
+    @classmethod
+    def tearDownClass(cls):
+        """ tearDownClass """
+        pass
+
+    def test_basic(self):
+        """ test basic apis 'next/size/drained'
+        """
+        iter_maker = _generate_iter_maker()
+        iter_source = IteratorSource(iter_maker)
+        for i, sample in enumerate(iter_source):
+            self.assertTrue('image' in sample)
+            self.assertGreater(len(sample['image']), 0)
+        self.assertTrue(iter_source.drained())
+        self.assertEqual(i + 1, iter_source.size())
+
+    def test_reset(self):
+        """ test functions 'reset/epoch_id'
+        """
+        iter_maker = _generate_iter_maker()
+        iter_source = IteratorSource(iter_maker)
+
+        self.assertTrue(iter_source.next() is not None)
+        self.assertEqual(iter_source.epoch_id(), 0)
+
+        iter_source.reset()
+
+        self.assertEqual(iter_source.epoch_id(), 1)
+        self.assertTrue(iter_source.next() is not None)
+
+
+if __name__ == '__main__':
+    unittest.main()

ppdet/data/tests/test_reader.py

@@ -8,6 +8,8 @@ import yaml
 
 import set_env
 from ppdet.data.reader import Reader
+from ppdet.data.source import build_source
+from ppdet.data.source import IteratorSource
 
 
 class TestReader(unittest.TestCase):
@@ -114,6 +116,31 @@ class TestReader(unittest.TestCase):
         self.assertEqual(out[0][5].shape[1], 1)
         self.assertGreaterEqual(ct, rcnn._maxiter)
 
+    def test_create(self):
+        """ Test create a reader using my source
+        """
+        def _my_data_reader():
+            mydata = build_source(self.rcnn_conf['DATA']['TRAIN'])
+            for i, sample in enumerate(mydata):
+                yield sample
+
+        my_source = IteratorSource(_my_data_reader)
+        mode = 'TRAIN'
+        train_rd = Reader.create(mode,
+            self.rcnn_conf['DATA'][mode],
+            self.rcnn_conf['TRANSFORM'][mode],
+            max_iter=10, my_source=my_source)
+
+        out = None
+        for sample in train_rd():
+            out = sample
+            self.assertTrue(sample is not None)
+        self.assertEqual(out[0][0].shape[0], 3)
+        self.assertEqual(out[0][1].shape[0], 3)
+        self.assertEqual(out[0][3].shape[1], 4)
+        self.assertEqual(out[0][4].shape[1], 1)
+        self.assertEqual(out[0][5].shape[1], 1)
+
 
 if __name__ == '__main__':
     unittest.main()