keras-team/keras · error · ValueError

Expected `trainable` to be a boolean. Received: trainable={t

Error message

Expected `trainable` to be a boolean. Received: trainable={trainable} (of type {type(trainable)})

What it means

Error "Expected `trainable` to be a boolean. Received: trainable={trainable} (of type {type(trainable)})" thrown in keras-team/keras.

Source

Thrown at keras/src/layers/layer.py:308

                "first layer in the model instead.",
                stacklevel=2,
            )
            self._input_shape_arg = input_shape_arg
        if kwargs:
            raise ValueError(
                "Unrecognized keyword arguments "
                f"passed to {self.__class__.__name__}: {kwargs}"
            )

        self._path = None  # Will be determined in `build_wrapper`
        self.built = False
        self.autocast = autocast
        self._input_spec = None
        self._called = False
        self.supports_jit = True

        if not isinstance(trainable, bool):
            raise ValueError(
                "Expected `trainable` to be a boolean. "
                f"Received: trainable={trainable} (of type "
                f"{type(trainable)})"
            )
        self._trainable = trainable
        self._losses = []
        self._loss_ids = set()
        self._losses_override = []

        self._call_signature = inspect.signature(self.call)
        self.call_signature_parameters = [
            p.name for p in self._call_signature.parameters.values()
        ]
        self._call_has_training_arg = (
            "training" in self.call_signature_parameters
        )
        self._call_has_mask_arg = "mask" in self.call_signature_parameters

View on GitHub (pinned to 7a34a03db6)

When it happens

Trigger: Thrown at keras/src/layers/layer.py:308 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/5795aada4c89c134. Report an issue: GitHub.