Merge pull request #8604 from Ruomei:toupstream/clusteringexample

PiperOrigin-RevId: 329802437

official/benchmark/models/resnet_imagenet_main.py

@@ -37,15 +37,16 @@ from official.vision.image_classification.resnet import imagenet_preprocessing
 from official.vision.image_classification.resnet import resnet_model
 
 
-def cluster_last_three_conv2d_layers(model):
-  import tensorflow_model_optimization as tfmot
+def _cluster_last_three_conv2d_layers(model):
+  """Helper method to cluster last three conv2d layers."""
+  import tensorflow_model_optimization as tfmot  # pylint: disable=g-import-not-at-top
   last_three_conv2d_layers = [
       layer for layer in model.layers
       if isinstance(layer, tf.keras.layers.Conv2D)
     ][-3:]
 
   cluster_weights = tfmot.clustering.keras.cluster_weights
-  CentroidInitialization = tfmot.clustering.keras.CentroidInitialization
+  centroid_initialization = tfmot.clustering.keras.CentroidInitialization
 
   def cluster_fn(layer):
     if layer not in last_three_conv2d_layers:
@@ -54,12 +55,12 @@ def cluster_last_three_conv2d_layers(model):
     if layer == last_three_conv2d_layers[0] or \
       layer == last_three_conv2d_layers[1]:
       clustered = cluster_weights(layer, number_of_clusters=256, \
-          cluster_centroids_init=CentroidInitialization.LINEAR)
-      print("Clustered {} with 256 clusters".format(layer.name))
+          cluster_centroids_init=centroid_initialization.LINEAR)
+      print('Clustered {} with 256 clusters'.format(layer.name))
     else:
       clustered = cluster_weights(layer, number_of_clusters=32, \
-          cluster_centroids_init=CentroidInitialization.LINEAR)
-      print("Clustered {} with 32 clusters".format(layer.name))
+          cluster_centroids_init=centroid_initialization.LINEAR)
+      print('Clustered {} with 32 clusters'.format(layer.name))
     return clustered
 
   return tf.keras.models.clone_model(model, clone_function=cluster_fn)
@@ -228,7 +229,7 @@ def run(flags_obj):
       model.load_weights(flags_obj.pretrained_filepath)
 
     if flags_obj.pruning_method == 'polynomial_decay':
-      import tensorflow_model_optimization as tfmot
+      import tensorflow_model_optimization as tfmot  # pylint: disable=g-import-not-at-top
       if dtype != tf.float32:
         raise NotImplementedError(
             'Pruning is currently only supported on dtype=tf.float32.')
@@ -246,12 +247,12 @@ def run(flags_obj):
       raise NotImplementedError('Only polynomial_decay is currently supported.')
 
     if flags_obj.clustering_method == 'selective_clustering':
-      import tensorflow_model_optimization as tfmot
+      import tensorflow_model_optimization as tfmot  # pylint: disable=g-import-not-at-top
       if dtype != tf.float32 or \
         flags_obj.fp16_implementation == 'graph_rewrite':
         raise NotImplementedError(
             'Clustering is currently only supported on dtype=tf.float32.')
-      model = cluster_last_three_conv2d_layers(model)
+      model = _cluster_last_three_conv2d_layers(model)
     elif flags_obj.clustering_method:
       raise NotImplementedError(
           'Only selective_clustering is implemented.')