keras-team/keras · error · TypeError

Only scalar arrays can be converted to Python scalars. Got:

Error message

Only scalar arrays can be converted to Python scalars. Got: shape={self.shape}

What it means

Error "Only scalar arrays can be converted to Python scalars. Got: shape={self.shape}" thrown in keras-team/keras.

Source

Thrown at keras/src/backend/common/variables.py:430

    def _initialize(self, value):
        raise NotImplementedError

    def _initialize_with_initializer(self, initializer):
        value = self._convert_to_tensor(
            initializer(self._shape, dtype=self._dtype)
        )
        self._initialize(value)

    def _convert_to_tensor(self, value, dtype=None):
        raise NotImplementedError

    def __getitem__(self, idx):
        return self.value.__getitem__(idx)

    def __int__(self):
        if self.ndim > 0:
            raise TypeError(
                "Only scalar arrays can be converted to Python scalars. "
                f"Got: shape={self.shape}"
            )
        return int(self.value)

    def __float__(self):
        if self.ndim > 0:
            raise TypeError(
                "Only scalar arrays can be converted to Python scalars. "
                f"Got: shape={self.shape}"
            )
        return float(self.value)

    def __array__(self, dtype=None):
        # We can't directly use self.value.__array__ here because of scalar.
        # Numpy require this method to return as array like object. In the case
        # of scalar, it will fail the type checking from numpy. We need to
        # return a 0d array via numpy.

View on GitHub (pinned to 7a34a03db6)

When it happens

Trigger: Thrown at keras/src/backend/common/variables.py:430 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/6a59b114fb2acffc. Report an issue: GitHub.