expose underlying migraphx::argument data pointer in pybind (#1376)

expose underlying p data inter for migraphx.argument
Update python api documentation

doc/src/reference/py.rst

@@ -84,6 +84,12 @@ argument
 
     Construct an argument from a python buffer. This can include numpy arrays.
 
+.. py:method:: data_ptr()
+
+    Returns the address to the underlying argument data.
+
+    :rtype: int
+
 .. py:method:: get_shape()
 
     Returns the shape of the argument.
@@ -113,7 +119,16 @@ argument
     :param shape s: Shape of argument to fill.
     :param int value: Value to fill in the argument.
 
-    :rtype argument
+    :rtype: argument
+
+.. py:function:: argument_from_pointer(shape, address)
+
+    Create argument from data stored in given address without copy.
+
+    :param shape shape: Shape of the data stored in address.
+    :param long address: Memory address of data from another source
+
+    :rtype: argument 
 
 target
 ------

src/py/migraphx_py.cpp

@@ -270,6 +270,8 @@ MIGRAPHX_PYBIND11_MODULE(migraphx, m)
                  new(&x) migraphx::argument(to_shape(info), info.ptr);
              })
         .def("get_shape", &migraphx::argument::get_shape)
+        .def("data_ptr",
+             [](migraphx::argument& x) { return reinterpret_cast<std::uintptr_t>(x.data()); })
         .def("tolist",
              [](migraphx::argument& x) {
                  py::list l{x.get_shape().elements()};