keras-team/keras · error · ValueError

{key} already exist in the LayoutMap with value {self._layou

Error message

{key} already exist in the LayoutMap with value {self._layout_map[key]}. Please make sure to not use duplicated keys.

What it means

Error "{key} already exist in the LayoutMap with value {self._layout_map[key]}. Please make sure to not use duplicated keys." thrown in keras-team/keras.

Source

Thrown at keras/src/distribution/distribution_lib.py:765

                f"Path '{key}' matches multiple layout "
                f"specification keys: {matching_keys}. Please make "
                "sure each tensor/variable path only matches at most "
                "one layout specification key in the LayoutMap."
            )
        elif len(matching_keys) == 1:
            return self._layout_map[matching_keys[0]]
        return None

    def __setitem__(self, key, layout):
        """Insert TensorLayout to the LayoutMap.

        Args:
            key: String key for the `TensorLayout`.
            layout: The `TensorLayout`. As a shortcut, tuple of string and None
                are also acceptable, and will be converted to `TensorLayout`.
        """
        if key in self._layout_map:
            raise ValueError(
                f"{key} already exist in the LayoutMap with "
                f"value {self._layout_map[key]}. Please make sure to "
                "not use duplicated keys."
            )
        if isinstance(layout, tuple):
            layout = TensorLayout(axes=layout, device_mesh=None)

        if not isinstance(layout, TensorLayout):
            raise ValueError(
                f"{layout} should be a TensorLayout type, got {type(layout)}"
            )
        self._maybe_populate_device_mesh(layout)
        self._layout_map[key] = layout

    def __delitem__(self, key):
        # let the dict to handle the key missing error
        return self._layout_map.pop(key)

View on GitHub (pinned to 7a34a03db6)

When it happens

Trigger: Thrown at keras/src/distribution/distribution_lib.py:765 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/fe86d68cf43199cc. Report an issue: GitHub.