revert mix_precision

python/paddle/fluid/contrib/mixed_precision/decorator.py

@@ -16,7 +16,6 @@ from ... import default_main_program
 from ... import default_startup_program
 from ... import layers
 from ... import unique_name
-from ... import framework
 from . import fp16_utils
 from .fp16_utils import rewrite_program
 from .fp16_utils import update_role_var_grad
@@ -133,7 +132,6 @@ class OptimizerWithMixedPrecision(object):
             gradient respectively, and the scaled loss.
         """
         rewrite_program(self._train_program, self._amp_lists)
-        with framework.name_scope('mixed_precision'):
         self._scaled_loss = loss * self._loss_scaling
         self._params_grads = self._optimizer.backward(
             self._scaled_loss, startup_program, parameter_list, no_grad_set,
@@ -158,13 +156,11 @@ class OptimizerWithMixedPrecision(object):
 
         grads = [g for _, g in params_grads]
         with self._train_program._optimized_guard(grads):
-            with framework.name_scope('mixed_precision'):
             grads, found_inf = check_finite_and_unscale(
                 grads, self._loss_scaling, name="find_infinite_scale")
 
         if self._use_dynamic_loss_scaling:
             with self._train_program._optimized_guard(grads):
-                with framework.name_scope('mixed_precision'):
                 grads = update_loss_scaling(
                     grads,
                     found_inf,