fix setvalue dtype error when using dy2st and amp O2 (#56868)

* fix setvalue dtype error when using dy2st and amp O2

* add one test

* remove test share_buffer since win/linux have different number

python/paddle/static/amp/fp16_utils.py

@@ -642,6 +642,10 @@ def cast_model_to_fp16(
 
     def need_process(op):
         need_process = True
+        if op.type in ["set_value"]:
+            # NOTE(zoooo0820): OP set_value has attribute "dtype", but its output type is
+            # determined by the input.dtype instead of attribute. So, here we still process it.
+            return need_process
         if op.type in ["create_py_reader", "read"]:
             need_process = False
         else:

test/amp/test_amp_api.py

@@ -258,5 +258,51 @@ class TestFp16Guard(AmpTestBase):
         paddle.disable_static()
 
 
+class SimpleModelIncludeSetValue(nn.Layer):
+    def __init__(self):
+        super().__init__()
+        self.norm = nn.LayerNorm(3)
+
+    def forward(self, x):
+        x = x + 1
+        tmp = x * 1
+        y = self.norm(tmp)
+        x[:] = y
+
+        z = x * 1
+        return z
+
+
+@unittest.skipIf(
+    not core.is_compiled_with_cuda()
+    or paddle.device.cuda.get_device_capability()[0] < 7.0,
+    "run test when gpu's compute capability is at least 7.0.",
+)
+class TestDy2STWithSetValue(AmpTestBase):
+    def test_op_called_as_expected(self):
+        expected_fp16_calls = {
+            "cast": 0,
+            "layer_norm": 1,
+            "scale": 3,
+            "set_value": 1,
+        }
+
+        func = SimpleModelIncludeSetValue()
+        func = paddle.amp.decorate(func, level='O2')
+        func = paddle.jit.to_static(func)
+        input = paddle.randn((2, 3))
+
+        with paddle.amp.auto_cast(level='O2'):
+            res = func(input)
+            loss = res.sum()
+            prog = func.forward.get_concrete_program(input)[1].forward_program
+            amp.debugging.collect_operator_stats(prog)
+            op_stats_list = amp.debugging._get_op_stats_list(prog)
+        loss.backward()
+        self._check_op_calls(
+            op_stats_list[0], expected_fp16_calls=expected_fp16_calls
+        )
+
+
 if __name__ == '__main__':
     unittest.main()