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

Partial indexing not supported in this basic implementation

Error message

Partial indexing not supported in this basic implementation

What it means

Error "Partial indexing not supported in this basic implementation" thrown in rohitg00/ai-engineering-from-scratch.

Source

Thrown at phases/01-math-foundations/12-tensor-operations/code/tensors.py:91

        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")

    def __setitem__(self, indices, value):
        if not isinstance(indices, tuple):
            indices = (indices,)
        self._data[self._flat_index(indices)] = value

    def reshape(self, new_shape):
        new_shape = list(new_shape)
        neg_idx = -1
        known_product = 1
        for i, s in enumerate(new_shape):
            if s == -1:
                if neg_idx != -1:
                    raise ValueError("Only one dimension can be -1")
                neg_idx = i
            else:
                known_product *= s

View on GitHub (pinned to 39ea8a1c6d)

When it happens

Trigger: Thrown at phases/01-math-foundations/12-tensor-operations/code/tensors.py:91 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/27aec9727dd70ebd. Report an issue: GitHub.