Coverage for /pythoncovmergedfiles/medio/medio/usr/local/lib/python3.8/site-packages/tensorflow/python/autograph/operators/conditional_expressions.py: 29%

1# Copyright 2020 The TensorFlow Authors. All Rights Reserved. 

2# 

3# Licensed under the Apache License, Version 2.0 (the "License"); 

4# you may not use this file except in compliance with the License. 

5# You may obtain a copy of the License at 

6# 

7# http://www.apache.org/licenses/LICENSE-2.0 

8# 

9# Unless required by applicable law or agreed to in writing, software 

10# distributed under the License is distributed on an "AS IS" BASIS, 

11# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 

12# See the License for the specific language governing permissions and 

13# limitations under the License. 

14# ============================================================================== 

15"""Conditional expressions (e.g. the ternary if statement).""" 

16 

17 

18from tensorflow.python.autograph.operators import control_flow 

19from tensorflow.python.autograph.utils import tensors 

20from tensorflow.python.ops import cond as tf_cond 

21 

22 

23def if_exp(cond, if_true, if_false, expr_repr): 

24 if tensors.is_dense_tensor(cond): 

25 return _tf_if_exp(cond, if_true, if_false, expr_repr) 

26 else: 

27 return _py_if_exp(cond, if_true, if_false) 

28 

29 

30def _tf_if_exp(cond, if_true, if_false, expr_repr): 

31 """Overload of if_exp that stages a TF cond.""" 

32 # TODO(mdan): Use nonlocal once we no longer need to support py2. 

33 true_val = [] 

34 false_val = [] 

35 

36 def true_fn(): 

37 true_val.append(if_true()) 

38 if true_val and false_val: 

39 control_flow.verify_single_cond_var(expr_repr, true_val[0], false_val[0]) 

40 return true_val[0] 

41 

42 def false_fn(): 

43 false_val.append(if_false()) 

44 if true_val and false_val: 

45 control_flow.verify_single_cond_var(expr_repr, true_val[0], false_val[0]) 

46 return false_val[0] 

47 

48 return tf_cond.cond(cond, true_fn, false_fn) 

49 

50 

51def _py_if_exp(cond, if_true, if_false): 

52 return if_true() if cond else if_false()