Support dict inputs in TFDataLayer, plus some lint fixes (#383)

keras_core/backend/tensorflow/random.py

@@ -34,9 +34,7 @@ def uniform(shape, minval=0.0, maxval=1.0, dtype=None, seed=None):
 
 def categorical(logits, num_samples, dtype="int64", seed=None):
     seed = tf_draw_seed(seed)
-    output = tf.random.stateless_categorical(
-        logits, num_samples, seed=seed
-    )
+    output = tf.random.stateless_categorical(logits, num_samples, seed=seed)
     return tf.cast(output, dtype)
 
 

keras_core/backend/torch/random.py

@@ -31,7 +31,10 @@ def categorical(logits, num_samples, dtype="int32", seed=None):
     dtype = to_torch_dtype(dtype)
     generator = torch_seed_generator(seed, device=get_device())
     return torch.multinomial(
-        logits, num_samples, replacement=True, generator=generator,
+        logits,
+        num_samples,
+        replacement=True,
+        generator=generator,
     ).type(dtype)
 
 

keras_core/layers/preprocessing/tf_data_layer.py

@@ -1,3 +1,5 @@
+from tensorflow import nest
+
 from keras_core import backend
 from keras_core.layers.layer import Layer
 from keras_core.utils import backend_utils
@@ -22,8 +24,11 @@ def __call__(self, inputs, **kwargs):
         ):
             # We're in a TF graph, e.g. a tf.data pipeline.
             self.backend.set_backend("tensorflow")
-            inputs = self.backend.convert_to_tensor(
-                inputs, dtype=self.compute_dtype
+            inputs = nest.map_structure(
+                lambda x: self.backend.convert_to_tensor(
+                    x, dtype=self.compute_dtype
+                ),
+                inputs,
             )
             switch_convert_input_args = False
             if self._convert_input_args: