Add prefixes to optimization warnings.

These prefixes -- applied to warnings where optimization is impossible because there is no C implementation -- are required to enable the logger to filter out redundant warnings.

Add prefixes to optimization warnings.
39af8a86 · Robert P. Goldman · Michael Osthege · b379b0f2 · 39af8a86
--- a/theano/tensor/opt.py
+++ b/theano/tensor/opt.py
@@ -7571,6 +7571,7 @@ def local_elemwise_fusion_op(op_class, max_input_fct=lambda node: 32, maker=None
                except (NotImplementedError, MethodNotDefined):
                    _logger.warning(
                        (
+                            "Optimization Warning: "
                            f"The Op {i.owner.op.scalar_op} does not provide a C implementation."
                            " As well as being potentially slow, this also disables "
                            "loop fusion."
@@ -7637,9 +7638,11 @@ your code will run correctly, but may be slower."""
                {"fail": "%(fail)s"},
            )
        except (NotImplementedError, MethodNotDefined):
+            name = str(s_new_out[0].owner.op)
            _logger.warning(
                (
-                    f"The Op {s_new_out[0].owner.op} does not provide a C implementation."
+                    "Optimization Warning: "
+                    f"The Op {name} does not provide a C implementation."
                    " As well as being potentially slow, this also disables "
                    "loop fusion."
                )