Reduce memory usage in TF building (#24046)

* Make the default dummies (2, 2) instead of (3, 3)

* Fix for Funnel

* Actually fix Funnel

src/transformers/modeling_tf_utils.py

@@ -1116,8 +1116,8 @@ class TFPreTrainedModel(tf.keras.Model, TFModelUtilsMixin, TFGenerationMixin, Pu
         dummies = {}
         sig = self._prune_signature(self.input_signature)
         for key, spec in sig.items():
-            # 3 is the most correct arbitrary size. I will not be taking questions
-            dummies[key] = tf.ones(shape=[dim if dim is not None else 3 for dim in spec.shape], dtype=spec.dtype)
+            # 2 is the most correct arbitrary size. I will not be taking questions
+            dummies[key] = tf.ones(shape=[dim if dim is not None else 2 for dim in spec.shape], dtype=spec.dtype)
             if key == "token_type_ids":
                 # Some models have token_type_ids but with a vocab_size of 1
                 dummies[key] = tf.zeros_like(dummies[key])
@@ -1125,7 +1125,7 @@ class TFPreTrainedModel(tf.keras.Model, TFModelUtilsMixin, TFGenerationMixin, Pu
             if "encoder_hidden_states" not in dummies:
                 if self.main_input_name == "input_ids":
                     dummies["encoder_hidden_states"] = tf.ones(
-                        shape=(3, 3, self.config.hidden_size), dtype=tf.float32, name="encoder_hidden_states"
+                        shape=(2, 2, self.config.hidden_size), dtype=tf.float32, name="encoder_hidden_states"
                     )
                 else:
                     raise NotImplementedError(

src/transformers/models/funnel/modeling_tf_funnel.py

@@ -242,6 +242,7 @@ class TFFunnelAttentionStructure:
                 # rel_pos = tf.broadcast_to(rel_pos, (rel_pos.shape[0], self.d_model))
                 rel_pos = tf.cast(rel_pos, dtype=zero_offset.dtype)
                 rel_pos = rel_pos + zero_offset
+                tf.debugging.assert_less(rel_pos, tf.shape(pos_embed)[0])
                 position_embeds_no_pooling = tf.gather(pos_embed, rel_pos, axis=0)
 
                 position_embeds_list.append([position_embeds_no_pooling, position_embeds_pooling])
@@ -974,6 +975,11 @@ class TFFunnelPreTrainedModel(TFPreTrainedModel):
     config_class = FunnelConfig
     base_model_prefix = "funnel"
 
+    @property
+    def dummy_inputs(self):
+        # Funnel misbehaves with very small inputs, so we override and make them a bit bigger
+        return {"input_ids": tf.ones((3, 3), dtype=tf.int32)}
+
 
 @dataclass
 class TFFunnelForPreTrainingOutput(ModelOutput):
@@ -1424,6 +1430,10 @@ class TFFunnelForMultipleChoice(TFFunnelPreTrainedModel, TFMultipleChoiceLoss):
         self.funnel = TFFunnelBaseLayer(config, name="funnel")
         self.classifier = TFFunnelClassificationHead(config, 1, name="classifier")
 
+    @property
+    def dummy_inputs(self):
+        return {"input_ids": tf.ones((3, 3, 4), dtype=tf.int32)}
+
     @unpack_inputs
     @add_start_docstrings_to_model_forward(FUNNEL_INPUTS_DOCSTRING.format("batch_size, num_choices, sequence_length"))
     @add_code_sample_docstrings(