#pragma once
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#include <pybind11/pybind11.h>
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#include <torch/csrc/utils/structseq.h>
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#include <torch/csrc/utils/object_ptr.h>
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namespace six {
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// Usually instances of PyStructSequence is also an instance of tuple
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// but in some py2 environment it is not, so we have to manually check
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// the name of the type to determine if it is a namedtupled returned
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// by a pytorch operator.
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inline bool isStructSeq(pybind11::handle input) {
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return pybind11::cast<std::string>(input.get_type().attr("__module__")) == "torch.return_types";
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}
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inline bool isStructSeq(PyObject* obj) {
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return isStructSeq(pybind11::handle(obj));
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}
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inline bool isTuple(pybind11::handle input) {
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if (PyTuple_Check(input.ptr())) {
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return true;
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}
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#if PY_MAJOR_VERSION == 2
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return isStructSeq(input);
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#else
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return false;
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#endif
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}
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inline bool isTuple(PyObject* obj) {
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return isTuple(pybind11::handle(obj));
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}
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// maybeAsTuple: if the input is a structseq, then convert it to a tuple
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//
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// On Python 3, structseq is a subtype of tuple, so these APIs could be used directly.
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// But on Python 2, structseq is not a subtype of tuple, so we need to manually create a
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// new tuple object from structseq.
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inline THPObjectPtr maybeAsTuple(PyStructSequence *obj) {
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#if PY_MAJOR_VERSION == 2
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return THPObjectPtr(torch::utils::structseq_slice(obj, 0, Py_SIZE(obj)));
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#else
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Py_INCREF(obj);
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return THPObjectPtr((PyObject *)obj);
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#endif
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}
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inline THPObjectPtr maybeAsTuple(PyObject *obj) {
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if (isStructSeq(obj))
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return maybeAsTuple((PyStructSequence *)obj);
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Py_INCREF(obj);
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return THPObjectPtr(obj);
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}
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} // namespace six
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