{"record":{"id":"d3ccf49288e97f67","repo":"rohitg00/ai-engineering-from-scratch","slug":"invalid-permutation-dims-for-rank-self-rank","errorCode":null,"errorMessage":"Invalid permutation {dims} for rank {self.rank}","messagePattern":"Invalid permutation (.+?) for rank (.+?)","errorType":"validation","errorClass":"ValueError","httpStatus":null,"severity":"error","filePath":"phases/01-math-foundations/12-tensor-operations/code/tensors.py","lineNumber":151,"sourceCode":"        if not new_shape:\n            new_shape = ()\n        return self.reshape(new_shape)\n\n    def unsqueeze(self, dim):\n        if dim < 0:\n            dim = len(self._shape) + 1 + dim\n        new_shape = list(self._shape)\n        new_shape.insert(dim, 1)\n        return self.reshape(tuple(new_shape))\n\n    def transpose(self, dim0, dim1):\n        perm = list(range(self.rank))\n        perm[dim0], perm[dim1] = perm[dim1], perm[dim0]\n        return self.permute(perm)\n\n    def permute(self, dims):\n        if sorted(dims) != list(range(self.rank)):\n            raise ValueError(f\"Invalid permutation {dims} for rank {self.rank}\")\n\n        new_shape = tuple(self._shape[d] for d in dims)\n        result = Tensor.__new__(Tensor)\n        result._shape = new_shape\n        result._strides = self._compute_strides(new_shape)\n        result._data = [0] * self.size\n\n        old_strides = self._strides\n        for old_indices in iterproduct(*(range(s) for s in self._shape)):\n            new_indices = tuple(old_indices[d] for d in dims)\n            old_flat = sum(i * s for i, s in zip(old_indices, old_strides))\n            new_flat = sum(\n                i * s for i, s in zip(new_indices, result._strides)\n            )\n            result._data[new_flat] = self._data[old_flat]\n\n        return result\n","sourceCodeStart":133,"sourceCodeEnd":169,"githubUrl":"https://github.com/rohitg00/ai-engineering-from-scratch/blob/39ea8a1c6d0b61f071226eff7ede4d4105fed820/phases/01-math-foundations/12-tensor-operations/code/tensors.py#L133-L169","documentation":"Error \"Invalid permutation {dims} for rank {self.rank}\" thrown in rohitg00/ai-engineering-from-scratch.","triggerScenarios":"Thrown at phases/01-math-foundations/12-tensor-operations/code/tensors.py:151 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":[],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"39ea8a1c6d0b61f071226eff7ede4d4105fed820","analyzedAt":"2026-08-26T03:13:46.626Z","schemaVersion":2},"datasetVersion":"2026-08-26T07:17:17.940Z"}