rohitg00/ai-engineering-from-scratch · error · IndexError

Expected {len(self._shape)} indices, got {len(indices)}

Error message

Expected {len(self._shape)} indices, got {len(indices)}

What it means

Error "Expected {len(self._shape)} indices, got {len(indices)}" thrown in rohitg00/ai-engineering-from-scratch.

Source

Thrown at phases/01-math-foundations/12-tensor-operations/code/tensors.py:74

    @property
    def shape(self):
        return self._shape

    @property
    def rank(self):
        return len(self._shape)

    @property
    def size(self):
        return len(self._data)

    @property
    def strides(self):
        return self._strides

    def _flat_index(self, indices):
        if len(indices) != len(self._shape):
            raise IndexError(
                f"Expected {len(self._shape)} indices, got {len(indices)}"
            )
        idx = 0
        for i, (ind, stride) in enumerate(zip(indices, self._strides)):
            if ind < 0 or ind >= self._shape[i]:
                raise IndexError(
                    f"Index {ind} out of range for axis {i} with size {self._shape[i]}"
                )
            idx += ind * stride
        return idx

    def __getitem__(self, indices):
        if not isinstance(indices, tuple):
            indices = (indices,)
        if len(indices) == len(self._shape):
            return self._data[self._flat_index(indices)]
        raise IndexError("Partial indexing not supported in this basic implementation")

View on GitHub (pinned to 39ea8a1c6d)

When it happens

Trigger: Thrown at phases/01-math-foundations/12-tensor-operations/code/tensors.py:74 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of rohitg00/ai-engineering-from-scratch@39ea8a1c6d (2026-08-26). Data as JSON: /api/errors/22f762b3d24d2a8b. Report an issue: GitHub.