[AMP OP&Test] Fix the rtol setting rules in bfloat16 forward (#51875)

Author: ZzSean

python/paddle/fluid/tests/unittests/eager_op_test.py

@@ -1727,11 +1727,9 @@ def convert_uint16_to_float_ifneed(self, actual_np, expect_np):
                 judge whether convert current output and expect to uint16.
                 return True | False
                 """
-                if actual_np.dtype == np.uint16 and expect_np.dtype in [
-                    np.float32,
-                    np.float64,
-                ]:
-                    actual_np = convert_uint16_to_float(actual_np)
+                if actual_np.dtype == np.uint16:
+                    if expect_np.dtype in [np.float32, np.float64]:
+                        actual_np = convert_uint16_to_float(actual_np)
                     self.rtol = 1.0e-2
                 elif actual_np.dtype == np.float16:
                     self.rtol = 1.0e-3
@@ -1828,10 +1826,7 @@ def _compare_numpy(self, name, actual_np, expect_np):
                     )
 
             def convert_uint16_to_float_ifneed(self, actual_np, expect_np):
-                if actual_np.dtype == np.uint16 and expect_np.dtype in [
-                    np.float32,
-                    np.float64,
-                ]:
+                if actual_np.dtype == np.uint16:
                     self.rtol = 1.0e-2
                 elif actual_np.dtype == np.float16:
                     self.rtol = 1.0e-3

python/paddle/fluid/tests/unittests/op_test.py

@@ -1723,11 +1723,9 @@ def convert_uint16_to_float_ifneed(self, actual_np, expect_np):
                 judge whether convert current output and expect to uint16.
                 return True | False
                 """
-                if actual_np.dtype == np.uint16 and expect_np.dtype in [
-                    np.float32,
-                    np.float64,
-                ]:
-                    actual_np = convert_uint16_to_float(actual_np)
+                if actual_np.dtype == np.uint16:
+                    if expect_np.dtype in [np.float32, np.float64]:
+                        actual_np = convert_uint16_to_float(actual_np)
                     self.rtol = 1.0e-2
                 elif actual_np.dtype == np.float16:
                     self.rtol = 1.0e-3
@@ -1787,10 +1785,7 @@ def find_expect_value(self, name):
                     return imperative_expect, imperative_expect_t
 
             def convert_uint16_to_float_ifneed(self, actual_np, expect_np):
-                if actual_np.dtype == np.uint16 and expect_np.dtype in [
-                    np.float32,
-                    np.float64,
-                ]:
+                if actual_np.dtype == np.uint16:
                     self.rtol = 1.0e-2
                 elif actual_np.dtype == np.float16:
                     self.rtol = 1.0e-3