Internal change

PiperOrigin-RevId: 381302776

Author: reedwm

official/modeling/performance.py

@@ -14,29 +14,16 @@
 
 """Functions and classes related to training performance."""
 
-from absl import logging
 import tensorflow as tf
 
 
 def configure_optimizer(optimizer,
                         use_float16=False,
                         use_graph_rewrite=False,
-                        loss_scale='dynamic',
-                        use_experimental_api=False):
+                        loss_scale='dynamic'):
   """Configures optimizer object with performance options."""
-  if use_experimental_api:
-    logging.warning('Passing use_experimental_api=True is deprecated. The '
-                    'argument will be removed in the future.')
   if use_float16:
-    # TODO(b/171936854): Move all methods to non-experimental api.
-    if use_experimental_api:
-      # Wraps optimizer with a LossScaleOptimizer. This is done automatically
-      # in compile() with the "mixed_float16" policy, but since we do not call
-      # compile(), we must wrap the optimizer manually.
-      optimizer = (
-          tf.keras.mixed_precision.experimental.LossScaleOptimizer(
-              optimizer, loss_scale=loss_scale))
-    elif loss_scale == 'dynamic':
+    if loss_scale == 'dynamic':
       optimizer = tf.keras.mixed_precision.LossScaleOptimizer(optimizer)
     else:
       # loss_scale is a number. We interpret that as a fixed loss scale.
@@ -52,34 +39,17 @@ def configure_optimizer(optimizer,
   return optimizer
 
 
-def set_mixed_precision_policy(dtype, loss_scale=None,
-                               use_experimental_api=False):
-  """Sets mix precision policy."""
-  if use_experimental_api:
-    logging.warning('Passing use_experimental_api=True is deprecated. The '
-                    'argument will be removed in the future.')
-  assert use_experimental_api or loss_scale is None, (
-      'loss_scale cannot be specified if use_experimental_api is False. If the '
-      'non-experimental API is used, specify the loss scaling configuration '
-      'when creating the LossScaleOptimizer instead.'
-  )
+def set_mixed_precision_policy(dtype, loss_scale=None):
+  """Sets the global `tf.keras.mixed_precision.Policy`."""
+  # TODO(b/191894773): Remove loss_scale argument
+  assert loss_scale is None, (
+      'The loss_scale argument must be None. The argument exists for '
+      'historical reasons and will be removed soon.')
   if dtype == tf.float16:
-    # TODO(b/171936854): Move all methods to non-experimental api.
-    if use_experimental_api:
-      policy = tf.keras.mixed_precision.experimental.Policy(
-          'mixed_float16', loss_scale=loss_scale)
-      tf.keras.mixed_precision.experimental.set_policy(policy)
-    else:
-      tf.keras.mixed_precision.set_global_policy('mixed_float16')
+    tf.keras.mixed_precision.set_global_policy('mixed_float16')
   elif dtype == tf.bfloat16:
-    if use_experimental_api:
-      tf.keras.mixed_precision.experimental.set_policy('mixed_bfloat16')
-    else:
-      tf.keras.mixed_precision.set_global_policy('mixed_bfloat16')
+    tf.keras.mixed_precision.set_global_policy('mixed_bfloat16')
   elif dtype == tf.float32:
-    if use_experimental_api:
-      tf.keras.mixed_precision.experimental.set_policy('float32')
-    else:
-      tf.keras.mixed_precision.set_global_policy('float32')
+    tf.keras.mixed_precision.set_global_policy('float32')
   else:
     raise ValueError('Unexpected dtype: %s' % dtype)