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tests/models/qwen3_5/test_modeling_qwen3_5.py

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+# Copyright 2026 The Qwen Team and The HuggingFace Inc. team. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Testing suite for the PyTorch Qwen3.5 model."""
+
+import copy
+import tempfile
+import unittest
+
+from parameterized import parameterized
+
+from transformers import AutoProcessor, AutoTokenizer, DataCollatorWithFlattening, is_torch_available
+from transformers.testing_utils import (
+    cleanup,
+    require_causal_conv1d,
+    require_flash_linear_attention,
+    require_torch,
+    require_torch_gpu,
+    slow,
+    torch_device,
+)
+
+from ...causal_lm_tester import CausalLMModelTest, CausalLMModelTester
+from ...generation.test_utils import GenerationTesterMixin
+from ...test_configuration_common import ConfigTester
+from ...test_modeling_common import (
+    ModelTesterMixin,
+    floats_tensor,
+    ids_tensor,
+)
+
+
+if is_torch_available():
+    import torch
+
+    from transformers import (
+        AutoModelForCausalLM,
+        DynamicCache,
+        Qwen3_5Config,
+        Qwen3_5ForCausalLM,
+        Qwen3_5ForConditionalGeneration,
+        Qwen3_5ForSequenceClassification,
+        Qwen3_5ForTokenClassification,
+        Qwen3_5Model,
+        Qwen3_5TextConfig,
+        Qwen3_5TextForSequenceClassification,
+        Qwen3_5TextModel,
+    )
+
+
+class Qwen3_5TextModelTester(CausalLMModelTester):
+    if is_torch_available():
+        base_model_class = Qwen3_5TextModel
+        causal_lm_class = Qwen3_5ForCausalLM
+        sequence_classification_class = Qwen3_5TextForSequenceClassification
+
+    def __init__(self, parent):
+        super().__init__(parent=parent)
+        self.hidden_act = "silu"
+        self.layer_types = ["full_attention", "linear_attention"]
+        self.linear_conv_kernel_dim = 2
+        self.linear_key_head_dim = 16
+        self.linear_value_head_dim = 16
+        self.linear_num_key_heads = 4
+        self.linear_num_value_heads = 8
+
+
+@require_torch
+class Qwen3_5TextModelTest(CausalLMModelTest, unittest.TestCase):
+    model_tester_class = Qwen3_5TextModelTester
+    config_class = Qwen3_5TextConfig
+    model_split_percents = [0.5, 0.8, 0.9]
+
+    def _get_conv_state_shape(self, batch_size: int, config):
+        num_v_heads = config.linear_num_value_heads
+        num_k_heads = config.linear_num_key_heads
+        head_k_dim = config.linear_key_head_dim
+        head_v_dim = config.linear_value_head_dim
+        intermediate_size = 2 * num_k_heads * head_k_dim + num_v_heads * head_v_dim
+
+        return (batch_size, intermediate_size, config.linear_conv_kernel_dim)
+
+    def _get_recurrent_state_shape(self, batch_size: int, config):
+        num_v_heads = config.linear_num_value_heads
+        head_k_dim = config.linear_key_head_dim
+        head_v_dim = config.linear_value_head_dim
+
+        return (batch_size, num_v_heads, head_k_dim, head_v_dim)
+
+    def test_attention_outputs(self):
+        "Needs to be overwritten as Qwen3.5 alternates between attention layers and gated deltanet layers."
+        config, inputs_dict = self.model_tester.prepare_config_and_inputs_for_common()
+        config.return_dict = True
+        # force eager attention to support output attentions
+        config._attn_implementation = "eager"
+        seq_len = getattr(self.model_tester, "seq_length", None)
+
+        for model_class in self.all_model_classes:
+            inputs_dict["output_attentions"] = True
+            inputs_dict["output_hidden_states"] = False
+            config.return_dict = True
+            model = model_class._from_config(config, attn_implementation="eager")
+            config = model.config
+            model.to(torch_device)
+            model.eval()
+            with torch.no_grad():
+                outputs = model(**self._prepare_for_class(inputs_dict, model_class))
+            attentions = outputs.attentions
+            self.assertEqual(len(attentions), sum(layer == "full_attention" for layer in config.layer_types))
+
+            # check that output_attentions also work using config
+            del inputs_dict["output_attentions"]
+            config.output_attentions = True
+            model = model_class(config)
+            model.to(torch_device)
+            model.eval()
+            with torch.no_grad():
+                outputs = model(**self._prepare_for_class(inputs_dict, model_class))
+            attentions = outputs.attentions
+            self.assertEqual(len(attentions), sum(layer == "full_attention" for layer in config.layer_types))
+            self.assertListEqual(list(attentions[0].shape[-3:]), [config.num_attention_heads, seq_len, seq_len])
+            out_len = len(outputs)
+
+            # Check attention is always last and order is fine
+            inputs_dict["output_attentions"] = True
+            inputs_dict["output_hidden_states"] = True
+            model = model_class(config)
+            model.to(torch_device)
+            model.eval()
+            with torch.no_grad():
+                outputs = model(**self._prepare_for_class(inputs_dict, model_class))
+                self_attentions = outputs.attentions
+
+            self.assertEqual(out_len + 1, len(outputs))
+            self.assertEqual(len(self_attentions), sum(layer == "full_attention" for layer in config.layer_types))
+            self.assertListEqual(list(self_attentions[0].shape[-3:]), [config.num_attention_heads, seq_len, seq_len])
+
+    @unittest.skip("The specific cache format cannot be instantiated from dp/ddp data.")
+    def test_multi_gpu_data_parallel_forward(self):
+        pass
+
+    @unittest.skip("Intentionally not reversable (no changes) as only load time within a VLM depends on this")
+    def test_reverse_loading_mapping(self, check_keys_were_modified=True):
+        pass
+
+    @require_causal_conv1d
+    @require_flash_linear_attention
+    @require_torch_gpu
+    def test_padding_free_matches_padded_fast_path_regression(self):
+        torch.manual_seed(0)
+        config = self.model_tester.get_config()
+        model = Qwen3_5ForCausalLM(config).to(torch_device).eval()
+
+        data_collator = DataCollatorWithFlattening(
+            return_tensors="pt", return_seq_idx=True, return_flash_attn_kwargs=True
+        )
+        test_cases = [
+            (
+                torch.tensor([[0, 0, 0, 1, 2, 3], [0, 0, 0, 0, 4, 5]], device=torch_device),
+                torch.tensor([[0, 0, 0, 1, 1, 1], [0, 0, 0, 0, 1, 1]], dtype=torch.long, device=torch_device),
+                [{"input_ids": [1, 2, 3]}, {"input_ids": [4, 5]}],
+            ),
+            (
+                torch.tensor([[0, 1, 2, 3, 4, 5], [0, 0, 0, 0, 0, 6]], device=torch_device),
+                torch.tensor([[0, 1, 1, 1, 1, 1], [0, 0, 0, 0, 0, 1]], dtype=torch.long, device=torch_device),
+                [{"input_ids": [1, 2, 3, 4, 5]}, {"input_ids": [6]}],
+            ),
+        ]
+
+        for padded_input_ids, attention_mask, features in test_cases:
+            position_ids = ((attention_mask == 1).long().cumsum(dim=1) - 1) * (attention_mask == 1).long()
+            padding_free_batch = data_collator(features)
+            padding_free_batch = {
+                key: value.to(torch_device) if torch.is_tensor(value) else value
+                for key, value in padding_free_batch.items()
+            }
+
+            with torch.no_grad():
+                res_padded = model(
+                    input_ids=padded_input_ids,
+                    attention_mask=attention_mask,
+                    position_ids=position_ids,
+                    use_cache=False,
+                )
+                res_padfree = model(**padding_free_batch, use_cache=False)
+
+            logits_padded = res_padded.logits[attention_mask.bool()]
+            logits_padfree = res_padfree.logits[0]
+
+            torch.testing.assert_close(logits_padded, logits_padfree, atol=1e-5, rtol=1e-5)
+
+    def test_linear_attention_multi_token_cached_forward_matches_single_token(self):
+        """
+        Qwen3.5's gated-delta-net layers must produce the same output for a token regardless of
+        whether it's fed as a single-token cached forward or as the first token of a multi-token
+        chunk after the cache has been populated (chunked prefill continuation / speculative
+        verification pattern). A causal LM can never have its logits at position `i` depend on
+        tokens at positions > `i`, even across separate forward calls with a shared cache.
+        """
+        config, _ = self.model_tester.prepare_config_and_inputs_for_common()
+        config._attn_implementation = "eager"
+        # GatedDeltaNet's fused norm-gate kernel only supports silu/swish/sigmoid; the shared
+        # tester's default `gelu` would raise before we get to exercise the cache path.
+        config.hidden_act = "silu"
+        model = Qwen3_5TextModel._from_config(config)
+        model.to(torch_device)
+        model.eval()
+
+        prefill_len = 8
+        prompt = ids_tensor((1, prefill_len), config.vocab_size).to(torch_device)
+        next_token = ids_tensor((1, 1), config.vocab_size).to(torch_device)
+
+        # Reference: prefill, then forward the next token alone with the populated cache.
+        cache_single = DynamicCache(config=config)
+        with torch.no_grad():
+            model(input_ids=prompt, past_key_values=cache_single, use_cache=True)
+            single_out = model(input_ids=next_token, past_key_values=cache_single, use_cache=True)
+        ref_first = single_out.last_hidden_state[:, 0, :]
+
+        # Under test: prefill, then forward [next_token, *distractors] in one call. The first
+        # position must match the single-token forward exactly (causal attention property).
+        distractors = ids_tensor((1, 7), config.vocab_size).to(torch_device)
+        multi_input = torch.cat([next_token, distractors], dim=1)
+        cache_multi = DynamicCache(config=config)
+        with torch.no_grad():
+            model(input_ids=prompt, past_key_values=cache_multi, use_cache=True)
+            multi_out = model(input_ids=multi_input, past_key_values=cache_multi, use_cache=True)
+        under_test_first = multi_out.last_hidden_state[:, 0, :]
+
+        torch.testing.assert_close(under_test_first, ref_first, rtol=1e-4, atol=1e-4)
+
+
+class Qwen3_5VisionText2TextModelTester:
+    def __init__(
+        self,
+        parent,
+        batch_size=3,
+        seq_length=7,
+        num_channels=3,
+        ignore_index=-100,
+        image_size=16,
+        text_config={
+            "bos_token_id": 0,
+            "eos_token_id": 1,
+            "pad_token_id": 2,
+            "hidden_act": "silu",
+            "head_dim": 8,
+            "hidden_size": 32,
+            "vocab_size": 99,
+            "intermediate_size": 37,
+            "max_position_embeddings": 512,
+            "model_type": "qwen3_5_text",
+            "num_attention_heads": 4,
+            "num_hidden_layers": 2,
+            "layer_types": ["full_attention", "linear_attention"],
+            "num_key_value_heads": 2,
+            "rope_theta": 10000,
+            "tie_word_embeddings": True,
+            "rope_parameters": {"rope_type": "default", "mrope_section": [16, 8, 8], "mrope_interleaved": True},
+            "linear_conv_kernel_dim": 2,
+            "linear_key_head_dim": 16,
+            "linear_value_head_dim": 16,
+            "linear_num_key_heads": 4,
+            "linear_num_value_heads": 8,
+        },
+        vision_config={
+            "depth": 2,
+            "in_chans": 3,
+            "hidden_act": "gelu_pytorch_tanh",
+            "intermediate_size": 32,
+            "out_hidden_size": 32,
+            "hidden_size": 32,
+            "num_heads": 4,
+            "patch_size": 16,
+            "spatial_merge_size": 1,
+            "temporal_patch_size": 2,
+            "num_position_embeddings": 16,
+        },
+        image_token_id=3,
+        video_token_id=4,
+        vision_start_token_id=5,
+        vision_end_token_id=6,
+        tie_word_embeddings=True,
+        is_training=True,
+    ):
+        self.parent = parent
+        self.ignore_index = ignore_index
+        self.is_training = is_training
+
+        self.vision_config = vision_config
+        self.text_config = text_config
+
+        self.vocab_size = text_config["vocab_size"]
+        self.bos_token_id = text_config["bos_token_id"]
+        self.eos_token_id = text_config["eos_token_id"]
+        self.pad_token_id = text_config["pad_token_id"]
+        self.head_dim = text_config["head_dim"]
+        self.hidden_size = text_config["hidden_size"]
+        self.intermediate_size = text_config["intermediate_size"]
+        self.num_hidden_layers = text_config["num_hidden_layers"]
+        self.num_attention_heads = text_config["num_attention_heads"]
+        self.num_key_value_heads = text_config["num_key_value_heads"]
+        self.rope_theta = text_config["rope_theta"]
+        self.rope_parameters = text_config["rope_parameters"]
+        self.hidden_act = text_config["hidden_act"]
+        self.max_position_embeddings = text_config["max_position_embeddings"]
+        self.model_type = text_config["model_type"]
+
+        self.vision_start_token_id = vision_start_token_id
+        self.vision_end_token_id = vision_end_token_id
+        self.image_token_id = image_token_id
+        self.video_token_id = video_token_id
+        self.tie_word_embeddings = tie_word_embeddings
+
+        self.batch_size = batch_size
+        self.num_channels = num_channels
+        self.image_size = image_size
+        self.num_image_tokens = 32
+        self.seq_length = seq_length + self.num_image_tokens
+
+    def get_config(self):
+        return Qwen3_5Config(
+            text_config=self.text_config,
+            vision_config=self.vision_config,
+            image_token_id=self.image_token_id,
+            video_token_id=self.video_token_id,
+            vision_start_token_id=self.vision_start_token_id,
+            vision_end_token_id=self.vision_end_token_id,
+            tie_word_embeddings=self.tie_word_embeddings,
+        )
+
+    def prepare_config_and_inputs(self):
+        config = self.get_config()
+        patch_size = config.vision_config.patch_size
+        temporal_patch_size = config.vision_config.temporal_patch_size
+        pixel_values = floats_tensor(
+            [
+                self.batch_size * (self.image_size**2) // (patch_size**2),
+                self.num_channels * (patch_size**2) * temporal_patch_size,
+            ]
+        )
+
+        return config, pixel_values
+
+    def prepare_config_and_inputs_for_common(self):
+        config_and_inputs = self.prepare_config_and_inputs()
+        config, pixel_values = config_and_inputs
+        input_ids = ids_tensor([self.batch_size, self.seq_length], self.vocab_size)
+        attention_mask = torch.ones(input_ids.shape, dtype=torch.long, device=torch_device)
+
+        input_ids[:, -1] = self.pad_token_id
+        input_ids[input_ids == self.video_token_id] = self.pad_token_id
+        input_ids[input_ids == self.image_token_id] = self.pad_token_id
+        input_ids[input_ids == self.vision_start_token_id] = self.pad_token_id
+        input_ids[:, self.num_image_tokens] = self.image_token_id
+        input_ids[:, self.num_image_tokens - 1] = self.vision_start_token_id
+
+        mm_token_type_ids = torch.zeros_like(input_ids)
+        mm_token_type_ids[:, self.num_image_tokens] = 1
+
+        inputs_dict = {
+            "pixel_values": pixel_values,
+            "image_grid_thw": torch.tensor([[1, 1, 1]] * self.batch_size, device=torch_device),
+            "input_ids": input_ids,
+            "attention_mask": attention_mask,
+            "mm_token_type_ids": mm_token_type_ids,
+        }
+        return config, inputs_dict
+
+
+@require_torch
+class Qwen3_5ModelTest(ModelTesterMixin, GenerationTesterMixin, unittest.TestCase):
+    """
+    Model tester for `Qwen3_5ForConditionalGeneration`.
+    """
+
+    all_model_classes = (
+        (
+            Qwen3_5Model,
+            Qwen3_5ForConditionalGeneration,
+            Qwen3_5ForSequenceClassification,
+            Qwen3_5ForTokenClassification,
+        )
+        if is_torch_available()
+        else ()
+    )
+    model_split_percents = [0.5, 0.8, 0.9]
+
+    def setUp(self):
+        self.model_tester = Qwen3_5VisionText2TextModelTester(self)
+        self.config_tester = ConfigTester(self, config_class=Qwen3_5Config, has_text_modality=False)
+
+    def test_config(self):
+        self.config_tester.run_common_tests()
+
+    @parameterized.expand([("from_pretrained",), ("from_config",)])
+    def test_automodelforcausallm(self, loader: str) -> None:
+        """`AutoModelForCausalLM` must unwrap the text sub-config for composite-to-text-only mappings."""
+        config = self.model_tester.get_config()
+        self.assertIsInstance(config, Qwen3_5Config, msg="Test setup expects the composite Qwen3_5Config.")
+
+        if loader == "from_config":
+            with torch.device("meta"):
+                model = AutoModelForCausalLM.from_config(config)
+        else:
+            full_model = Qwen3_5ForConditionalGeneration(config)
+            with tempfile.TemporaryDirectory() as tmp_dir:
+                full_model.save_pretrained(tmp_dir)
+                model = AutoModelForCausalLM.from_pretrained(tmp_dir)
+
+        self.assertIsInstance(model, Qwen3_5ForCausalLM)
+        self.assertIsInstance(model.config, Qwen3_5TextConfig)
+
+    @unittest.skip(
+        "Conversion only for the `CausalLM` loading from saved `ConditionalLM`, doesn't apply to simple VLM"
+    )
+    def test_reverse_loading_mapping(self, check_keys_were_modified=True):
+        pass
+
+    @unittest.skip("Qwen3.5 hybrid linear-attention cache is not compatible with quantized cache yet.")
+    def test_generate_with_quant_cache(self):
+        pass
+
+    def _get_conv_state_shape(self, batch_size: int, config):
+        num_v_heads = config.linear_num_value_heads
+        num_k_heads = config.linear_num_key_heads
+        head_k_dim = config.linear_key_head_dim
+        head_v_dim = config.linear_value_head_dim
+        intermediate_size = 2 * num_k_heads * head_k_dim + num_v_heads * head_v_dim
+
+        return (batch_size, intermediate_size, config.linear_conv_kernel_dim)
+
+    def _get_recurrent_state_shape(self, batch_size: int, config):
+        num_v_heads = config.linear_num_value_heads
+        head_k_dim = config.linear_key_head_dim
+        head_v_dim = config.linear_value_head_dim
+
+        return (batch_size, num_v_heads, head_k_dim, head_v_dim)
+
+    def test_attention_outputs(self):
+        "Needs to be overwritten as Qwen3.5 alternates between attention layers and gated deltanet layers."
+        config, inputs_dict = self.model_tester.prepare_config_and_inputs_for_common()
+        config.return_dict = True
+        # force eager attention to support output attentions
+        config._attn_implementation = "eager"
+        seq_len = getattr(self.model_tester, "seq_length", None)
+
+        for model_class in self.all_model_classes:
+            inputs_dict["output_attentions"] = True
+            inputs_dict["output_hidden_states"] = False
+            config.return_dict = True
+            model = model_class._from_config(config, attn_implementation="eager")
+            config = model.config
+            model.to(torch_device)
+            model.eval()
+            with torch.no_grad():
+                outputs = model(**self._prepare_for_class(inputs_dict, model_class))
+            attentions = outputs.attentions
+            self.assertEqual(
+                len(attentions), sum(layer == "full_attention" for layer in config.text_config.layer_types)
+            )
+
+            # check that output_attentions also work using config
+            del inputs_dict["output_attentions"]
+            config.text_config.output_attentions = True
+            model = model_class(config)
+            model.to(torch_device)
+            model.eval()
+            with torch.no_grad():
+                outputs = model(**self._prepare_for_class(inputs_dict, model_class))
+            attentions = outputs.attentions
+            self.assertEqual(
+                len(attentions), sum(layer == "full_attention" for layer in config.text_config.layer_types)
+            )
+            self.assertListEqual(
+                list(attentions[0].shape[-3:]), [config.text_config.num_attention_heads, seq_len, seq_len]
+            )
+            out_len = len(outputs)
+
+            # Check attention is always last and order is fine
+            inputs_dict["output_attentions"] = True
+            inputs_dict["output_hidden_states"] = True
+            model = model_class(config)
+            model.to(torch_device)
+            model.eval()
+            with torch.no_grad():
+                outputs = model(**self._prepare_for_class(inputs_dict, model_class))
+                self_attentions = outputs.attentions
+
+            self.assertEqual(out_len + 1, len(outputs))
+            self.assertEqual(
+                len(self_attentions), sum(layer == "full_attention" for layer in config.text_config.layer_types)
+            )
+            self.assertListEqual(
+                list(self_attentions[0].shape[-3:]), [config.text_config.num_attention_heads, seq_len, seq_len]
+            )
+
+    def test_mismatching_num_image_tokens(self):
+        """
+        Tests that VLMs throw an explicit error when image count mismatches image-token count in text.
+        Also checks multi-image cases where one prompt has multiple image tokens.
+        """
+        config, input_dict = self.model_tester.prepare_config_and_inputs_for_common()
+        for model_class in self.all_model_classes:
+            model = model_class(config).to(torch_device)
+            model.eval()
+            _ = model(**input_dict)
+            curr_input_dict = copy.deepcopy(input_dict)
+
+            patch_size = config.vision_config.patch_size
+            one_img_length = (self.model_tester.image_size**2) // (patch_size**2)
+            curr_input_dict["pixel_values"] = curr_input_dict["pixel_values"][-one_img_length:, ...]
+            curr_input_dict["image_grid_thw"] = curr_input_dict["image_grid_thw"][-1:, ...]
+            with self.assertRaises(ValueError):
+                _ = model(**curr_input_dict)
+
+            if hasattr(model.base_model, "rope_deltas"):
+                model.base_model.rope_deltas = None
+
+            input_ids = curr_input_dict["input_ids"][:1]
+            mm_token_type_ids = curr_input_dict["mm_token_type_ids"][:1]
+            pixel_values = curr_input_dict["pixel_values"][:one_img_length]
+            image_grid_thw = curr_input_dict["image_grid_thw"][:1]
+            input_ids = torch.cat([input_ids, input_ids], dim=0)
+            mm_token_type_ids = torch.cat([mm_token_type_ids, mm_token_type_ids], dim=0)
+
+            with self.assertRaises(ValueError):
+                _ = model(
+                    input_ids=input_ids,
+                    pixel_values=pixel_values,
+                    image_grid_thw=image_grid_thw,
+                    mm_token_type_ids=mm_token_type_ids,
+                )
+
+            if hasattr(model.base_model, "rope_deltas"):
+                model.base_model.rope_deltas = None
+
+            pixel_values = torch.cat([pixel_values, pixel_values], dim=0)
+            image_grid_thw = torch.cat([image_grid_thw, image_grid_thw], dim=0)
+            _ = model(
+                input_ids=input_ids,
+                pixel_values=pixel_values,
+                image_grid_thw=image_grid_thw,
+                mm_token_type_ids=mm_token_type_ids,
+            )
+
+    def test_image_forward(self):
+        config, _ = self.model_tester.prepare_config_and_inputs_for_common()
+
+        bsz = self.model_tester.batch_size
+        channels = config.vision_config.in_chans
+        temporal_patch = config.vision_config.temporal_patch_size
+        patch_size = config.vision_config.patch_size
+        num_images = 2
+
+        input_ids = ids_tensor([bsz, self.model_tester.seq_length], self.model_tester.vocab_size)
+        input_ids[:, -1] = self.model_tester.pad_token_id
+        input_ids[input_ids == self.model_tester.video_token_id] = self.model_tester.pad_token_id
+        input_ids[input_ids == self.model_tester.image_token_id] = self.model_tester.pad_token_id
+        input_ids[input_ids == self.model_tester.vision_start_token_id] = self.model_tester.pad_token_id
+        input_ids[input_ids == self.model_tester.vision_end_token_id] = self.model_tester.pad_token_id
+
+        patches_per_image = 1
+        pixel_values = floats_tensor(
+            [
+                bsz * num_images * patches_per_image,
+                channels * temporal_patch * (patch_size**2),
+            ]
+        )
+        image_grid_thw = torch.tensor([[1, 1, 1]] * (bsz * num_images), device=torch_device)
+        self.assertEqual(pixel_values.shape[0], image_grid_thw.prod(dim=1).sum().item())
+
+        insertion_point = 0
+        tokens_per_image = 3  # vision_start + image_token + vision_end
+        required_seq_length = insertion_point + num_images * tokens_per_image
+        self.assertLessEqual(required_seq_length, input_ids.shape[1])
+
+        for b in range(bsz):
+            for image_idx in range(num_images):
+                image_start = insertion_point + image_idx * tokens_per_image
+                input_ids[b, image_start] = self.model_tester.vision_start_token_id
+                input_ids[b, image_start + 1] = self.model_tester.image_token_id
+                input_ids[b, image_start + 2] = self.model_tester.vision_end_token_id
+
+        mm_token_type_ids = torch.zeros_like(input_ids)
+        mm_token_type_ids[input_ids == self.model_tester.image_token_id] = 1
+
+        for model_class in self.all_model_classes:
+            model = model_class(config).to(torch_device)
+            outputs = model(
+                input_ids=input_ids,
+                pixel_values=pixel_values,
+                image_grid_thw=image_grid_thw,
+                mm_token_type_ids=mm_token_type_ids,
+            )
+            self.assertIsNotNone(outputs)
+
+    def test_video_forward(self):
+        config, _ = self.model_tester.prepare_config_and_inputs_for_common()
+
+        bsz = self.model_tester.batch_size
+        channels = config.vision_config.in_chans
+        temporal_patch = config.vision_config.temporal_patch_size
+        patch_size = config.vision_config.patch_size
+
+        input_ids = ids_tensor([bsz, self.model_tester.seq_length], self.model_tester.vocab_size)
+
+        frames = 4
+        num_video = 2
+        frame_timestamp_tokens = 5
+        patch_h = self.model_tester.image_size // patch_size
+        patch_w = self.model_tester.image_size // patch_size
+        patch_t = frames // temporal_patch
+        patches_per_video = patch_t * patch_h * patch_w
+        patches_per_frame = patch_h * patch_w
+        pixel_values_videos = floats_tensor(
+            [
+                bsz * num_video * patches_per_video,
+                channels * temporal_patch * (patch_size**2),
+            ]
+        )
+
+        video_grid_thw = torch.tensor([[patch_t, patch_h, patch_w]] * (bsz * num_video), device=torch_device)
+        self.assertEqual(pixel_values_videos.shape[0], video_grid_thw.prod(dim=1).sum().item())
+
+        input_ids[:, -1] = self.model_tester.pad_token_id
+        input_ids[input_ids == self.model_tester.video_token_id] = self.model_tester.pad_token_id
+        input_ids[input_ids == self.model_tester.image_token_id] = self.model_tester.pad_token_id
+        input_ids[input_ids == self.model_tester.vision_start_token_id] = self.model_tester.pad_token_id
+        input_ids[input_ids == self.model_tester.vision_end_token_id] = self.model_tester.pad_token_id
+
+        insertion_point = 0
+        tokens_per_frame = frame_timestamp_tokens + 1 + patches_per_frame + 1
+        tokens_per_video = patch_t * tokens_per_frame
+        required_seq_length = insertion_point + num_video * tokens_per_video
+        if required_seq_length > input_ids.shape[1]:
+            pad_extension = torch.full(
+                (bsz, required_seq_length - input_ids.shape[1]),
+                self.model_tester.pad_token_id,
+                dtype=input_ids.dtype,
+                device=input_ids.device,
+            )
+            input_ids = torch.cat([input_ids, pad_extension], dim=1)
+
+        timestamp_start_token_id = self.model_tester.vision_end_token_id + 1
+        self.assertLessEqual(timestamp_start_token_id + frame_timestamp_tokens, self.model_tester.vocab_size)
+        timestamp_token_ids = torch.arange(
+            timestamp_start_token_id,
+            timestamp_start_token_id + frame_timestamp_tokens,
+            device=input_ids.device,
+            dtype=input_ids.dtype,
+        )
+
+        self.assertLessEqual(required_seq_length, input_ids.shape[1])
+        for b in range(bsz):
+            for video_idx in range(num_video):
+                video_start = insertion_point + video_idx * tokens_per_video
+                for frame_idx in range(patch_t):
+                    frame_start = video_start + frame_idx * tokens_per_frame
+                    input_ids[b, frame_start : frame_start + frame_timestamp_tokens] = timestamp_token_ids
+
+                    vision_start_pos = frame_start + frame_timestamp_tokens
+                    input_ids[b, vision_start_pos] = self.model_tester.vision_start_token_id
+
+                    frame_token_start = vision_start_pos + 1
+                    frame_token_end = frame_token_start + patches_per_frame
+                    input_ids[b, frame_token_start:frame_token_end] = self.model_tester.video_token_id
+                    input_ids[b, frame_token_end] = self.model_tester.vision_end_token_id
+
+        mm_token_type_ids = torch.zeros_like(input_ids)
+        mm_token_type_ids[input_ids == self.model_tester.video_token_id] = 2
+
+        for model_class in self.all_model_classes:
+            model = model_class(config).to(torch_device)
+            outputs = model(
+                input_ids=input_ids,
+                pixel_values_videos=pixel_values_videos,
+                video_grid_thw=video_grid_thw,
+                mm_token_type_ids=mm_token_type_ids,
+            )
+            self.assertIsNotNone(outputs)
+
+    @unittest.skip("The specific cache format cannot be instantiated from dp/ddp data.")
+    def test_multi_gpu_data_parallel_forward(self):
+        pass
+
+
+@require_torch
+class Qwen3_5IntegrationTest(unittest.TestCase):
+    model_id = "Qwen/Qwen3.5-0.8B"
+
+    def setUp(self):
+        cleanup(torch_device, gc_collect=True)
+
+    def tearDown(self):
+        cleanup(torch_device, gc_collect=True)
+
+    @slow
+    def test_model_logits(self):
+        input_ids = [1, 306, 4658, 278, 6593, 310, 2834, 338]
+        model = Qwen3_5ForCausalLM.from_pretrained(self.model_id, device_map="auto")
+        input_ids = torch.tensor([input_ids]).to(model.model.embed_tokens.weight.device)
+
+        with torch.no_grad():
+            logits = model(input_ids).logits.float().cpu()
+
+        self.assertEqual(logits.shape[0], 1)
+        self.assertEqual(logits.shape[1], len(input_ids[0]))
+        self.assertTrue(torch.isfinite(logits).all().item())
+
+        # Greedy token picks on each position should remain stable for this checkpoint.
+        expected_argmax = torch.tensor([[198, 74, 9230, 198, 1, 264, 1, 198]])
+        torch.testing.assert_close(logits.argmax(-1), expected_argmax)
+
+    @slow
+    def test_model_generation(self):
+        expected_text_completion = "My favourite condiment is 100% real.\nThe 100% real is the only one that is"
+        prompt = "My favourite condiment is "
+
+        tokenizer = AutoTokenizer.from_pretrained(self.model_id, use_fast=False)
+        model = Qwen3_5ForCausalLM.from_pretrained(self.model_id, device_map="auto")
+        prompt_inputs = tokenizer(prompt, return_tensors="pt").to(model.model.embed_tokens.weight.device)
+
+        generated_ids = model.generate(
+            **prompt_inputs,
+            max_new_tokens=20,
+            do_sample=False,
+        )
+        text = tokenizer.decode(generated_ids[0], skip_special_tokens=True)
+
+        self.assertEqual(expected_text_completion, text)
+
+    @slow
+    def test_model_vision_generation(self):
+        message = [
+            {
+                "role": "user",
+                "content": [
+                    {
+                        "type": "image",
+                        "url": "https://huggingface.co/datasets/huggingface/documentation-images/resolve/main/pipeline-cat-chonk.jpeg",
+                    },
+                    {"type": "text", "text": "What kind of animal is this?"},
+                ],
+            }
+        ]
+
+        processor = AutoProcessor.from_pretrained(self.model_id)
+        model = Qwen3_5ForConditionalGeneration.from_pretrained(self.model_id, dtype="auto", device_map="auto")
+
+        inputs = processor.apply_chat_template(
+            message, tokenize=True, add_generation_prompt=True, return_dict=True, return_tensors="pt"
+        )
+
+        expected_input_ids = [248045, 846, 198, 248053, 248056, 248056, 248056, 248056, 248056, 248056]
+        self.assertListEqual(expected_input_ids, inputs.input_ids[0].tolist()[:10])
+
+        expected_pixel_slice = torch.tensor(
+            [
+                [-0.0902, -0.0824, -0.0824],
+                [-0.2627, -0.2627, -0.2627],
+                [-0.0824, -0.0902, -0.0902],
+                [-0.0118, -0.0510, -0.1137],
+            ],
+            dtype=torch.float32,
+            device="cpu",
+        )
+        self.assertListEqual(
+            [round(x, 3) for x in expected_pixel_slice.flatten().tolist()],
+            [round(x, 3) for x in inputs.pixel_values[:4, :3].flatten().tolist()],
+        )
+
+        inputs = inputs.to(model.device)
+        output = model.generate(**inputs, max_new_tokens=30, do_sample=False)
+        decoded_text = processor.decode(output[0], skip_special_tokens=True)
+        self.assertIn("What kind of animal is this?", decoded_text)
+        self.assertIn("cat", decoded_text.lower())
+
+    @slow
+    def test_model_video_generation(self):
+        message = [
+            {
+                "role": "user",
+                "content": [
+                    {
+                        "type": "video",
+                        "url": "https://huggingface.co/datasets/raushan-testing-hf/videos-test/resolve/main/sample_demo_1.mp4",
+                    },
+                    {"type": "text", "text": "Describe the video in short."},
+                ],
+            }
+        ]
+
+        processor = AutoProcessor.from_pretrained(self.model_id, max_image_size={"longest_edge": 50176})
+        model = Qwen3_5ForConditionalGeneration.from_pretrained(self.model_id, dtype="auto", device_map="auto")
+
+        inputs = processor.apply_chat_template(
+            message, tokenize=True, add_generation_prompt=True, return_dict=True, return_tensors="pt"
+        )
+        expected_input_ids = [248045, 846, 198, 27, 15, 13, 18, 6283, 29, 248053]
+        self.assertListEqual(expected_input_ids, inputs.input_ids[0].tolist()[:10])
+
+        expected_video_slice = torch.tensor(
+            [
+                [-0.757, -0.757, -0.757],
+                [-0.694, -0.639, -0.498],
+                [-0.773, -0.773, -0.773],
+                [-0.373, -0.357, -0.373],
+            ],
+            dtype=torch.float32,
+            device="cpu",
+        )
+        self.assertListEqual(
+            [round(x, 3) for x in expected_video_slice.flatten().tolist()],
+            [round(x, 3) for x in inputs.pixel_values_videos[:4, :3].flatten().tolist()],
+        )
+
+        inputs = inputs.to(model.device)
+        output = model.generate(**inputs, max_new_tokens=30, do_sample=False)
+        decoded_text = processor.decode(output[0], skip_special_tokens=True)
+        self.assertIn("Describe the video in short.", decoded_text)
+        self.assertIn("seconds>", decoded_text)
+        self.assertIn("assistant", decoded_text)
+
+    @slow
+    def test_model_video_generation_batch(self):
+        message = [
+            {
+                "role": "user",
+                "content": [
+                    {
+                        "type": "video",
+                        "url": "https://huggingface.co/datasets/raushan-testing-hf/videos-test/resolve/main/sample_demo_1.mp4",
+                    },
+                    {"type": "text", "text": "Describe the video in short."},
+                ],
+            }
+        ]
+        batch_messages = [message, message]
+
+        processor = AutoProcessor.from_pretrained(self.model_id, max_image_size={"longest_edge": 50176})
+        model = Qwen3_5ForConditionalGeneration.from_pretrained(self.model_id, dtype="auto", device_map="auto")
+
+        inputs = processor.apply_chat_template(
+            batch_messages,
+            tokenize=True,
+            add_generation_prompt=True,
+            return_dict=True,
+            return_tensors="pt",
+            padding=True,
+        )
+        expected_input_ids = [248045, 846, 198, 27, 15, 13, 18, 6283, 29, 248053]
+        self.assertListEqual(expected_input_ids, inputs.input_ids[0].tolist()[:10])
+        self.assertListEqual(expected_input_ids, inputs.input_ids[1].tolist()[:10])
+
+        inputs = inputs.to(model.device)
+        output = model.generate(**inputs, max_new_tokens=30, do_sample=False)
+        decoded_text = processor.batch_decode(output, skip_special_tokens=True)
+
+        expected_decoded_text = [
+            "user\n<0.3 seconds><1.3 seconds><2.4 seconds><3.5 seconds><4.6 seconds><5.6 seconds><6.7 seconds><7.8 seconds><8.9 seconds><9.7 seconds>Describe the video in short.\nassistant\n<think>\n\n</think>\n\nA toddler is sitting on a bed and reading a book.\n",
+            "user\n<0.3 seconds><1.3 seconds><2.4 seconds><3.5 seconds><4.6 seconds><5.6 seconds><6.7 seconds><7.8 seconds><8.9 seconds><9.7 seconds>Describe the video in short.\nassistant\n<think>\n\n</think>\n\nA toddler is sitting on a bed and reading a book.\n",
+        ]
+        self.assertEqual(expected_decoded_text, decoded_text)
+
+    @slow
+    def test_model_video_generation_batch_mixed(self):
+        video_message = [
+            {
+                "role": "user",
+                "content": [
+                    {
+                        "type": "video",
+                        "url": "https://huggingface.co/datasets/raushan-testing-hf/videos-test/resolve/main/sample_demo_1.mp4",
+                    },
+                    {"type": "text", "text": "Describe the video in short."},
+                ],
+            }
+        ]
+        text_only_message = [{"role": "user", "content": [{"type": "text", "text": "Who are you?"}]}]
+        batch_messages = [video_message, text_only_message]
+
+        processor = AutoProcessor.from_pretrained(self.model_id, max_image_size={"longest_edge": 50176})
+        processor.tokenizer.padding_side = "left"
+        model = Qwen3_5ForConditionalGeneration.from_pretrained(self.model_id, dtype="auto", device_map="auto")
+
+        inputs = processor.apply_chat_template(
+            batch_messages,
+            tokenize=True,
+            add_generation_prompt=True,
+            return_dict=True,
+            return_tensors="pt",
+            padding=True,
+        ).to(model.device)
+        output = model.generate(**inputs, max_new_tokens=30, do_sample=False)
+        decoded_text = processor.batch_decode(output, skip_special_tokens=True)
+
+        self.assertEqual(len(decoded_text), 2)
+        self.assertIn("Describe the video in short.", decoded_text[0])
+        self.assertIn("seconds>", decoded_text[0])
+        self.assertIn("toddler", decoded_text[0].lower())
+
+        self.assertIn("Who are you?", decoded_text[1])
+        self.assertIn("qwen", decoded_text[1].lower())
+
+    @slow
+    def test_model_video_generation_batch_different_videos(self):
+        message_1 = [
+            {
+                "role": "user",
+                "content": [
+                    {
+                        "type": "video",
+                        "url": "https://huggingface.co/datasets/raushan-testing-hf/videos-test/resolve/main/sample_demo_1.mp4",
+                    },
+                    {"type": "text", "text": "Describe the video in short."},
+                ],
+            }
+        ]
+        message_2 = [
+            {
+                "role": "user",
+                "content": [
+                    {
+                        "type": "video",
+                        "url": "https://huggingface.co/datasets/hf-internal-testing/fixtures_videos/resolve/main/tennis.mp4",
+                    },
+                    {"type": "text", "text": "Describe the video in short."},
+                ],
+            }
+        ]
+        batch_messages = [message_1, message_2]
+
+        processor = AutoProcessor.from_pretrained(self.model_id, max_image_size={"longest_edge": 50176})
+        processor.tokenizer.padding_side = "left"
+        model = Qwen3_5ForConditionalGeneration.from_pretrained(self.model_id, dtype="auto", device_map="auto")
+
+        inputs = processor.apply_chat_template(
+            batch_messages,
+            tokenize=True,
+            add_generation_prompt=True,
+            return_dict=True,
+            return_tensors="pt",
+            padding=True,
+        ).to(model.device)
+        output = model.generate(**inputs, max_new_tokens=30, do_sample=False)
+        decoded_text = processor.batch_decode(output, skip_special_tokens=True)
+
+        self.assertEqual(len(decoded_text), 2)
+        self.assertIn("Describe the video in short.", decoded_text[0])
+        self.assertIn("seconds>", decoded_text[0])
+        self.assertIn("Describe the video in short.", decoded_text[1])
+        self.assertIn("seconds>", decoded_text[1])
+        self.assertIn("tennis", decoded_text[1].lower())