keras-team/keras · error · ValueError

Unknown variable name: {k}

Error message

Unknown variable name: {k}

What it means

Error "Unknown variable name: {k}" thrown in keras-team/keras.

Source

Thrown at keras/src/models/model.py:1212

            elif k == "non_trainable_variables":
                self._assign_variable_values(
                    self.non_trainable_variables, path_value_dict
                )
            elif k == "optimizer_variables":
                if hasattr(self, "optimizer") and self.optimizer is not None:
                    self._assign_variable_values(
                        self.optimizer.variables, path_value_dict
                    )
            elif k == "metrics_variables":
                if (
                    hasattr(self, "metrics_variables")
                    and self.metrics_variables
                ):
                    self._assign_variable_values(
                        self.metrics_variables, path_value_dict
                    )
            else:
                raise ValueError(f"Unknown variable name: {k}")

    def _assign_variable_values(self, variables, path_value_dict):
        for path, value in path_value_dict.items():
            for variable in variables:
                if variable.path == path:
                    variable.assign(value)

    def _flatten_nested_dict(self, nested_dict):
        flat_dict = {}

        def _flatten(current_dict, prefix=""):
            for key, value in current_dict.items():
                if isinstance(value, dict):
                    _flatten(value, f"{prefix}{key}/")
                else:
                    flat_dict[f"{prefix}{key}"] = value

        _flatten(nested_dict)

View on GitHub (pinned to 7a34a03db6)

When it happens

Trigger: Thrown at keras/src/models/model.py:1212 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of keras-team/keras@7a34a03db6 (2026-08-25). Data as JSON: /api/errors/88c8c0c7a8d6caf4. Report an issue: GitHub.