[model] add Qwen2.5-Omni model (#7537)

* preserve image_sizes

* preserve image_sizes

* init plugin

* support audio-text2text lora

* nit

* support image/video-text2text, audio-text2text

* remove args

* remove lines

* add docs && nit

* remove some comments

* fix && add merge part script

* add license

scripts/lora_part_merge.py

@@ -0,0 +1,90 @@
+# Copyright 2025 HuggingFace Inc. and the LlamaFactory team.
+#
+# This code is based on the HuggingFace's PEFT library.
+# https://github.com/huggingface/peft/blob/v0.10.0/examples/loftq_finetuning/quantize_save_load.py
+#
+# 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.
+import os
+import shutil
+
+import fire
+from peft import PeftModel
+from transformers import AutoModel, AutoProcessor, AutoTokenizer
+
+
+def merge_lora(
+    base_model_path: str,
+    lora_checkpoint_path: str,
+    extra_file: str = "spk_dict.pt",
+    submodule_name: str = "thinker",
+    save_path: str = "./merged_model_checkpoint",
+):
+    """Load the original model, tokenizer, and processor configuration, merge the LoRA weights.
+
+    for a specified submodule, and save the final merged model along with its configurations.
+
+    Args:
+        base_model_path (str): Path to the original model directory.
+        lora_checkpoint_path (str): Path to the directory containing LoRA weights.
+        extra_file (str): Name of the extra file to be copied (default: "spk_dict.pt").
+        submodule_name (str): Name of the submodule to merge (default: "thinker").
+        save_path (str): Directory where the merged model and configurations will be saved.
+    """
+    # 1. Load the original model, tokenizer, and processor
+    model = AutoModel.from_pretrained(base_model_path)
+    tokenizer = AutoTokenizer.from_pretrained(base_model_path)
+
+    try:
+        processor = AutoProcessor.from_pretrained(base_model_path)
+    except Exception:
+        print("Processor configuration not found, skipping processor load.")
+        processor = None
+
+    print("Successfully loaded the original model, tokenizer, and processor (if available).")
+
+    # 2. Extract the submodule to be merged (e.g., model.thinker)
+    if not hasattr(model, submodule_name):
+        raise AttributeError(f"The model does not have a submodule named '{submodule_name}'.")
+    base_submodule = getattr(model, submodule_name)
+    print(f"Successfully extracted submodule: {submodule_name}.")
+
+    # 3. Load the LoRA weights onto the extracted submodule
+    lora_model = PeftModel.from_pretrained(base_submodule, lora_checkpoint_path)
+    print("LoRA weights loaded successfully.")
+
+    # 4. Merge the LoRA weights into the submodule and unload the LoRA modules
+    merged_submodule = lora_model.merge_and_unload()
+    print("LoRA weights merged successfully.")
+
+    # 5. Replace the original submodule with the merged submodule in the model
+    setattr(model, submodule_name, merged_submodule)
+
+    # 6. Save the final merged model along with the tokenizer and processor configuration
+    model.save_pretrained(save_path)
+    tokenizer.save_pretrained(save_path)
+    if processor is not None:
+        processor.save_pretrained(save_path)
+
+    print(f"Merged model and configuration saved to {save_path}.")
+
+    source_file = os.path.join(base_model_path, extra_file)
+    target_file = os.path.join(save_path, extra_file)
+    if os.path.exists(source_file):
+        shutil.copy(source_file, target_file)
+        print(f"File '{extra_file}' copied from {base_model_path} to {save_path}.")
+    else:
+        print(f"File '{extra_file}' not found in {base_model_path}, skipping copy.")
+
+
+if __name__ == "__main__":
+    fire.Fire(merge_lora)