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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Custom operations over user defined types that creates new instance of userdefined type","articleBody":"Is it possible to define custom operation that creates instances of user defined type?\n\n```python\nNP_UDT = np.dtype([(\"x\", np.int64), (\"y\", np.float64)], align=True)\nUDT = gb.dtypes.register_new(\"UDT\", NP_UDT)\n\nv1 = gb.Vector(Point, size=10)\nv1[0] = (1, 4.5) # Tuple works here\n\n# I want to define a function that creates new UDT from int and float passed as parameters\ndef udt_add_op(x, y):\n    # When I try to use tuple here (similarly to assignment to v1[0]) it fails with exception below.\n    return ??? # What should be here to create new UDT(x,y) ?\n\nBinaryOp.register_new(\"udt_add\", udt_add_op,is_udt=True)\n\ndef v_add(v1, v2):\n    gb.Vector.ewise_add(v1, v2, \"udt_add\")\n    ...\n```\n\nException on attempt to return tuple from ```udt_add_op```:\n\n```\nTraceback (most recent call last):\n  File \"\u003cstdin\u003e\", line 1, in \u003cmodule\u003e\n  File \"example.py\", line 24, in v_add\n    v3 \u003c\u003c gb.Vector.ewise_add(v1, v2, \"points_add\")\n  File \"/miniconda3/lib/python3.10/site-packages/graphblas/core/vector.py\", line 998, in ewise_add\n    return self._ewise_add(other, op)\n  File \"/miniconda3/lib/python3.10/site-packages/graphblas/core/vector.py\", line 1029, in _ewise_add\n    op = get_typed_op(op, self.dtype, other.dtype, kind=\"binary\")\n  File \"/miniconda3/lib/python3.10/site-packages/graphblas/core/operator/utils.py\", line 112, in get_typed_op\n    return get_typed_op(\n  File \"/miniconda3/lib/python3.10/site-packages/graphblas/core/operator/utils.py\", line 43, in get_typed_op\n    return op._compile_udt(dtype, dtype2)\n  File \"/miniconda3/lib/python3.10/site-packages/graphblas/core/operator/binary.py\", line 609, in _compile_udt\n    ret_type = lookup_dtype(numba_func.overloads[sig].signature.return_type)\n  File \"/miniconda3/lib/python3.10/site-packages/graphblas/core/dtypes.py\", line 374, in lookup_dtype\n    raise ValueError(f\"Unknown dtype: {key} of type {type(key)}\")\nValueError: Unknown dtype: Tuple(Literal[int](1), float64) of type \u003cclass 'numba.core.types.containers.Tuple'\u003e\n```","author":{"url":"https://github.com/gsvgit","@type":"Person","name":"gsvgit"},"datePublished":"2025-09-23T14:34:34.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/564/python-graphblas/issues/564"}