Update error message in push tape.

PiperOrigin-RevId: 267436813
2019-09-05 13:12:29 -07:00 · 2019-09-05 13:12:29 -07:00 · c3339328ea
commit c3339328ea
parent 3a5371dd1c
1 changed files with 3 additions and 1 deletions
--- a/tensorflow/python/eager/backprop.py
+++ b/tensorflow/python/eager/backprop.py
@ -816,8 +816,10 @@ class GradientTape(object):
      self._pop_tape()

  def _push_tape(self):
+    """Pushes a new tape onto the tape stack."""
    if self._recording:
-      raise ValueError("Tape is already recording.")
+      raise ValueError("Tape is still recording, This can happen if you try to "
+                       "re-enter an already-active tape.")
    if self._tape is None:
      self._tape = tape.push_new_tape(
          persistent=self._persistent,