👁️ Added SFT support for SmolVLM models via standalone script `sft_…

…vlm_smol_vlm.py` (#2409)

* Added SFT VLM script for SmolVLM

* Run make precommit

* Updated command example

examples/scripts/sft_vlm_smol_vlm.py

@@ -0,0 +1,145 @@
+# Copyright 2024 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.
+"""
+pip install pillow
+
+# Tested on 8x H100 GPUs
+accelerate launch
+    --config_file=examples/accelerate_configs/deepspeed_zero3.yaml \
+    sft_vlm_smol_vlm.py \
+    --dataset_name HuggingFaceH4/llava-instruct-mix-vsft \
+    --model_name_or_path HuggingFaceTB/SmolVLM-Instruct \
+    --per_device_train_batch_size 1 \
+    --gradient_accumulation_steps 1 \
+    --output_dir sft-smol-vlm-hf \
+    --bf16 \
+    --torch_dtype bfloat16 \
+    --gradient_checkpointing \
+    --use_peft \
+    --lora_target_modules down_proj, o_proj, k_proj, q_proj, gate_proj, up_proj, v_proj
+
+For LLaVA-NeXT, use: (requires transformers>=4.45)
+    --model_name_or_path llava-hf/llava-v1.6-mistral-7b-hf
+
+For meta-llama/Llama-3.2-11B-Vision-Instruct, use: (requires transformers>=4.45.1)
+    --model_name_or_path meta-llama/Llama-3.2-11B-Vision-Instruct
+"""
+
+import torch
+from datasets import load_dataset
+from transformers import (
+    AutoModelForVision2Seq,
+    AutoProcessor,
+    Idefics3ForConditionalGeneration,
+    LlavaForConditionalGeneration,
+)
+
+from trl import (
+    ModelConfig,
+    ScriptArguments,
+    SFTConfig,
+    SFTTrainer,
+    TrlParser,
+    get_kbit_device_map,
+    get_peft_config,
+    get_quantization_config,
+)
+
+
+if __name__ == "__main__":
+    parser = TrlParser((ScriptArguments, SFTConfig, ModelConfig))
+    script_args, training_args, model_config = parser.parse_args_and_config()
+    training_args.gradient_checkpointing_kwargs = dict(use_reentrant=False)
+    training_args.remove_unused_columns = False
+    training_args.dataset_kwargs = {"skip_prepare_dataset": True}
+
+    ################
+    # Model, Tokenizer & Processor
+    ################
+    torch_dtype = (
+        model_config.torch_dtype
+        if model_config.torch_dtype in ["auto", None]
+        else getattr(torch, model_config.torch_dtype)
+    )
+    quantization_config = get_quantization_config(model_config)
+    model_kwargs = dict(
+        revision=model_config.model_revision,
+        attn_implementation=model_config.attn_implementation,
+        torch_dtype=torch_dtype,
+        device_map=get_kbit_device_map() if quantization_config is not None else None,
+        quantization_config=quantization_config,
+    )
+    processor = AutoProcessor.from_pretrained(
+        model_config.model_name_or_path, trust_remote_code=model_config.trust_remote_code
+    )
+
+    model = AutoModelForVision2Seq.from_pretrained(
+        model_config.model_name_or_path, trust_remote_code=model_config.trust_remote_code, **model_kwargs
+    )
+
+    ################
+    # Create a data collator to encode text and image pairs
+    ################
+    def collate_fn(examples):
+        # Get the texts and images, and apply the chat template
+        texts = [processor.apply_chat_template(example["messages"], tokenize=False) for example in examples]
+        images = [example["images"] for example in examples]
+        if isinstance(model, LlavaForConditionalGeneration):
+            # LLava1.5 does not support multiple images
+            images = [image[0] for image in images]
+
+        # Tokenize the texts and process the images
+        batch = processor(text=texts, images=images, return_tensors="pt", padding=True)
+
+        # The labels are the input_ids, and we mask the padding tokens in the loss computation
+        labels = batch["input_ids"].clone()
+        labels[labels == processor.tokenizer.pad_token_id] = -100  #
+        # Ignore the image token index in the loss computation (model specific)
+        if isinstance(model, Idefics3ForConditionalGeneration):
+            image_token_id = processor.tokenizer.additional_special_tokens_ids[
+                processor.tokenizer.additional_special_tokens.index("<image>")
+            ]
+        else:
+            image_token_id = processor.tokenizer.convert_tokens_to_ids(processor.image_token)
+        labels[labels == image_token_id] = -100
+        batch["labels"] = labels
+
+        return batch
+
+    ################
+    # Dataset
+    ################
+    dataset = load_dataset(script_args.dataset_name)
+
+    ################
+    # Training
+    ################
+    trainer = SFTTrainer(
+        model=model,
+        args=training_args,
+        data_collator=collate_fn,
+        train_dataset=dataset[script_args.dataset_train_split],
+        eval_dataset=dataset[script_args.dataset_test_split] if training_args.eval_strategy != "no" else None,
+        processing_class=processor.tokenizer,
+        peft_config=get_peft_config(model_config),
+    )
+
+    trainer.train()
+
+    # Save and push to hub
+    trainer.save_model(training_args.output_dir)
+    if training_args.push_to_hub:
+        trainer.push_to_hub(dataset_name=script_args.dataset_name)
+        if trainer.accelerator.is_main_process:
+            processor.push_to_hub(training_args.hub_model_id)