Try a fix

keras_nlp/src/utils/tensor_utils.py

@@ -20,6 +20,8 @@
 import keras
 import numpy as np
 from keras import ops
+from collections.abc import Mapping
+from collections.abc import Sequence
 
 try:
     import tensorflow as tf
@@ -115,13 +117,13 @@ def convert_preprocessing_inputs(x):
     if not tf.executing_eagerly() or in_no_convert_scope():
         return x
 
-    if isinstance(x, dict):
+    if isinstance(x, Mapping):
         return {k: convert_preprocessing_inputs(x[k]) for k, v in x.items()}
     if isinstance(x, tuple):
         return tuple(convert_preprocessing_inputs(v) for v in x)
     if isinstance(x, (str, bytes)):
         return tf.constant(x)
-    if isinstance(x, list):
+    if isinstance(x, Sequence):
         try:
             numpy_x = np.array(x)
         except ValueError as e: