Add more information to error message in contrib data function capturing.

Example error message now looks like:

ValueError: Cannot capture a stateful node (name:random_uniform, type:RandomUniformInt) by value.
PiperOrigin-RevId: 157258472

1 files changed, 4 insertions, 2 deletions

diff --git a/tensorflow/contrib/data/python/framework/function.py b/tensorflow/contrib/data/python/framework/function.py
index 751beb7853..2839130ab7 100644
--- a/tensorflow/contrib/data/python/framework/function.py
+++ b/tensorflow/contrib/data/python/framework/function.py
@@ -86,9 +86,11 @@ class _ExperimentalFuncGraph(function._FuncGraph):
   def _add_op_and_parents(self, op):
     op_def = function._get_op_def(op)
     if op_def.is_stateful:
-      raise ValueError("Cannot capture a stateful node by value.")
+      raise ValueError("Cannot capture a stateful node (name:%s, type:%s) "
+                       "by value." % (op.name, op.type))
     elif op.type in ("Placeholder", "PlaceholderV2"):
-      raise ValueError("Cannot capture a placeholder by value.")
+      raise ValueError("Cannot capture a placeholder (name:%s, type:%s) "
+                       "by value." % (op.name, op.type))
 
     captured_inputs = [self._add_tensor_and_parents(x) for x in op.inputs]