message: Quiet warning about default `to_dense` call in base class LinearOperator.
diff: @@ -939,8 +939,6 @@ class LinearOperator(module.Module):
  def _to_dense(self):
  """Generic and often inefficient implementation. Override often."""
  - logging.warn("Using (possibly slow) default implementation of to_dense."
  - " Converts by self.matmul(identity).")
  if self.batch_shape.is_fully_defined():
  batch_shape = self.batch_shape
  else:
  