Convert inputs to tensor (#2108)

Author: WindQAQ

tensorflow_addons/losses/triplet.py

@@ -105,8 +105,8 @@ def triplet_semihard_loss(
     Returns:
       triplet_loss: float scalar with dtype of `y_pred`.
     """
-
-    labels, embeddings = y_true, y_pred
+    labels = tf.convert_to_tensor(y_true, name="labels")
+    embeddings = tf.convert_to_tensor(y_pred, name="embeddings")
 
     convert_to_float32 = (
         embeddings.dtype == tf.dtypes.float16 or embeddings.dtype == tf.dtypes.bfloat16
@@ -242,7 +242,8 @@ def triplet_hard_loss(
     Returns:
       triplet_loss: float scalar with dtype of `y_pred`.
     """
-    labels, embeddings = y_true, y_pred
+    labels = tf.convert_to_tensor(y_true, name="labels")
+    embeddings = tf.convert_to_tensor(y_pred, name="embeddings")
 
     convert_to_float32 = (
         embeddings.dtype == tf.dtypes.float16 or embeddings.dtype == tf.dtypes.bfloat16