keras-team/keras · error · ValueError

input_tensor specified: {input_tensor}is not a keras tensor

Error message

input_tensor specified: {input_tensor}is not a keras tensor

What it means

Error "input_tensor specified: {input_tensor}is not a keras tensor" thrown in keras-team/keras.

Source

Thrown at keras/src/applications/mobilenet_v3.py:224

                    raise ValueError(
                        "When backend.image_data_format()=channels_first, "
                        "input_shape[1] must equal "
                        "input_tensor.shape[1].  Received "
                        f"input_shape={input_shape}, "
                        "input_tensor.shape="
                        f"{input_tensor.shape}"
                    )
            else:
                if input_tensor.shape[2] != input_shape[1]:
                    raise ValueError(
                        "input_shape[1] must equal "
                        "input_tensor.shape[2].  Received "
                        f"input_shape={input_shape}, "
                        "input_tensor.shape="
                        f"{input_tensor.shape}"
                    )
        else:
            raise ValueError(
                "input_tensor specified: ",
                input_tensor,
                "is not a keras tensor",
            )

    # If input_shape is None, infer shape from input_tensor
    if input_shape is None and input_tensor is not None:
        try:
            backend.is_keras_tensor(input_tensor)
        except ValueError:
            raise ValueError(
                "input_tensor: ",
                input_tensor,
                "is type: ",
                type(input_tensor),
                "which is not a valid type",
            )

View on GitHub (pinned to 7a34a03db6)

When it happens

Trigger: Thrown at keras/src/applications/mobilenet_v3.py:224 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/b596a60f7cc64adb. Report an issue: GitHub.