add tensor dot api and delete useless api in tensor.py

docs/source/tensor.rst

@@ -46,6 +46,7 @@ OneFlow Tensor Class
             cpu, 
             cuda,
             data, 
+            dot,
             detach, 
             device, 
             placement,

oneflow/api/python/framework/tensor_functions.cpp

@@ -283,6 +283,7 @@ DIRECT_PASS_FUNC(PyTensorObject_pow, functional::pow)
 DIRECT_PASS_FUNC(PyTensorObject_chunk, functional::chunk)
 DIRECT_PASS_FUNC(PyTensorObject_narrow, functional::narrow)
 DIRECT_PASS_FUNC(PyTensorObject_masked_fill, functional::masked_fill)
+DIRECT_PASS_FUNC(PyTensorObject_dot, functional::dot)
 
 // functions that parsing at Python C api layer
 static PyObject* PyTensorObject_byte(PyObject* self, PyObject* unused) {
@@ -880,6 +881,7 @@ PyMethodDef PyTensorObject_extra_methods[] = {
     {"chunk", (PyCFunction)PyTensorObject_chunk, METH_VARARGS | METH_KEYWORDS, NULL},
     {"narrow", (PyCFunction)PyTensorObject_narrow, METH_VARARGS | METH_KEYWORDS, NULL},
     {"masked_fill", (PyCFunction)PyTensorObject_masked_fill, METH_VARARGS | METH_KEYWORDS, NULL},
+    {"dot", (PyCFunction)PyTensorObject_dot, METH_VARARGS | METH_KEYWORDS, NULL},
 
     // macro UNARY_METHOD
     {"abs", PyTensorObject_abs, METH_NOARGS, NULL},

python/oneflow/framework/docstr/tensor.py

@@ -1294,6 +1294,13 @@
     """,
 )
 
+add_docstr(
+    oneflow.Tensor.dot,
+    """
+    See :func:`oneflow.dot`
+    """,
+)
+
 add_docstr(
     oneflow.Tensor.selu,
     """