change hook grad input to tuple

mindspore/ccsrc/vm/vm.cc

@@ -624,8 +624,8 @@ BaseRef FinalVM::RunHook(const PrimitivePtr &prim, const VectorRef &args) {
     if (_hook_grad.find(cell_id) != _hook_grad.end()) {
       py::tuple hook_args = py::tuple(3);
       hook_args[0] = cell_id;
-      hook_args[1] = _hook_grad[cell_id];
-      hook_args[2] = py_args[2];
+      hook_args[1] = py::make_tuple(_hook_grad[cell_id]);
+      hook_args[2] = py::make_tuple(py_args[2]);
       py::function fn_hook = prim->hook();
       obj = fn_hook(*hook_args);
       if (py::isinstance<py::none>(obj)) {
@@ -638,7 +638,7 @@ BaseRef FinalVM::RunHook(const PrimitivePtr &prim, const VectorRef &args) {
     }
   } else {
     py::function fn_hook = prim->hook();
-    obj = fn_hook(py_args[2]);
+    obj = fn_hook(py::make_tuple(py_args[2]));
     if (py::isinstance<py::none>(obj)) {
       obj = py_args[2];
     }

tests/ut/python/pynative_mode/test_hook.py

@@ -30,13 +30,13 @@ def weight_variable():
 
 def cell_hook_function(cell_id, grad_input, grad_output):
     print(cell_id)
-    assert(grad_output.asnumpy().shape == (32, 6, 14, 14))
-    assert(grad_input.asnumpy().shape == (32, 16, 10, 10))
+    assert(grad_output[0].asnumpy().shape == (32, 6, 14, 14))
+    assert(grad_input[0].asnumpy().shape == (32, 16, 10, 10))
 
 
 def var_hook_function(grad_out):
     print("grad:", grad_out)
-    assert(grad_out.asnumpy().shape == (32, 120))
+    assert(grad_out[0].asnumpy().shape == (32, 120))
 
 
 class LeNet5(nn.Cell):