[fix] fix an issue where tf_patch.py failed in TF >= 2.6.x. It cause …

…by Keras detached from TF repo.

tensorflow_recommenders_addons/dynamic_embedding/python/ops/tf_patch.py

@@ -27,6 +27,20 @@
   kinit2 = None
   pass  # for compatible with TF < 2.3.x
 
+try:
+  import tensorflow as tf
+  kinit_tf = tf.keras.initializers
+except ImportError:
+  kinit_tf = None
+  pass  # for compatible with TF >= 2.6.x
+
+try:
+  import keras as K
+  kinit_K = K.initializers
+except ImportError:
+  kinit_K = None
+  pass  # for compatible with standalone Keras
+
 from tensorflow.core.framework import node_def_pb2
 from tensorflow.python.eager import context
 from tensorflow.python.framework import device as pydev
@@ -351,3 +365,7 @@ def patch_on_tf():
     kinit1.VarianceScaling.__call__ = __call__for_keras_init_v1
   if kinit2 is not None:
     kinit2.VarianceScaling.__call__ = __call__for_keras_init_v2
+  if kinit_tf is not None:
+    kinit_tf.VarianceScaling.__call__ = __call__for_keras_init_v2
+  if kinit_K is not None:
+    kinit_K.VarianceScaling.__call__ = __call__for_keras_init_v2