2 Copyright (c) 2018-2019 Intel Corporation
4 Licensed under the Apache License, Version 2.0 (the "License");
5 you may not use this file except in compliance with the License.
6 You may obtain a copy of the License at
8 http://www.apache.org/licenses/LICENSE-2.0
10 Unless required by applicable law or agreed to in writing, software
11 distributed under the License is distributed on an "AS IS" BASIS,
12 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 See the License for the specific language governing permissions and
14 limitations under the License.
18 from mo.front.tf.extractors.utils import tf_dtype_extractor
21 def tf_range_infer(node):
22 start = node.in_node(0)
23 limit = node.in_node(1)
24 delta = node.in_node(2)
25 output = node.out_node()
27 if not start.has_valid('value') or not limit.has_valid('value') or not delta.has_valid('value'):
28 log.error("Range operation is supported with constant inputs only")
30 if 'type' in node.pb.attr:
31 result_data_type = tf_dtype_extractor(node.pb.attr["type"].type)
33 result_data_type = start.value.dtype
34 output.value = np.arange(start.value, limit.value, delta.value, dtype=result_data_type)
35 output.shape = np.array(output.value.shape, dtype=np.int64)
37 # Some notes on the automatic result data type infer. The tf.range does is differently than np.arange. Numpy
38 # by default creates array with elements of type int64 and float64, but TF does not widen data types and keep them
42 # >>> tf.range(1, 5, 0.5)
43 # <tf.Tensor 'range_1:0' shape = (8,) dtype = float32>
44 # >>> tf.range(1, 5, 2)
45 # <tf.Tensor 'range_2:0' shape = (2,) dtype = int32>
47 # >>> np.array([0.5], dtype=np.float32)
48 # array([0.5], dtype=float32)
49 # >>> np.arange(np.array([1], dtype=np.int32), np.array([5], dtype=np.int32), np.array([2], dtype=np.int32)).dtype
51 # >>> np.arange(np.array([1], dtype=np.int32), np.array([5], dtype=np.int32), np.array([0.5], dtype=np.float32)).dtype