commit a9f9c45eb514fd7a40a8e0eb11085749130e5670
author Vishal Subbiah <vishalsubbiah@users.noreply.github.com> Mon Jul 06 13:35:16 2020 -0700
committer GitHub <noreply@github.com> Mon Jul 06 13:35:16 2020 -0700
tree d38e936fdbc4dd36a822c96483f538b852583b23
parent 31b48f4d235909dae621cee4c1fc98898d99f0a7

adding comment.

tensorflow/python/keras/backend.py

diff --git a/tensorflow/python/keras/backend.py b/tensorflow/python/keras/backend.py
index 6c3e70a..121725f 100644
--- a/tensorflow/python/keras/backend.py
+++ b/tensorflow/python/keras/backend.py
@@ -4541,10 +4541,10 @@
   Returns:
       A tensor.
   """
-  if hasattr(x, "dtype"):
-    dtype = x.dtype
-  else:
-    dtype = floatx()
+  # While x can be a tensor or variable, we also see cases where 
+  # numpy arrays, lists, tuples are passed as well.
+  # lists, tuples do not have 'dtype' attribute.
+  dtype = getattr(x, 'dtype', floatx())
   if alpha != 0.:
     if max_value is None and threshold == 0:
       return nn.leaky_relu(x, alpha=alpha)