message: Document meaning of 'learning_phase' values.
diff: @@ -342,6 +342,7 @@ def set_learning_phase(value):
  Arguments:
  value: Learning phase value, either 0 or 1 (integers).
  + 0 = test, 1 = train
  Raises:
  ValueError: if `value` is neither `0` nor `1`.
  @@ -366,6 +367,7 @@ def learning_phase_scope(value):
  Arguments:
  value: Learning phase value, either 0 or 1 (integers).
  + 0 = test, 1 = train
  Yields:
  None.
  @@ -408,6 +410,7 @@ def eager_learning_phase_scope(value):
  Arguments:
  value: Learning phase value, either 0 or 1 (integers).
  + 0 = test, 1 = train
  Yields:
  None.
  