Merge pull request #72 from rhymes-ai/gptfast_chat

add a teminal chat interface to gptfast version

gptfast/README.md

@@ -8,8 +8,40 @@ python scripts/download.py --repo_id $MODEL_REPO
 python scripts/convert_hf_checkpoint.py --checkpoint_dir checkpoints/$MODEL_REPO
 ```
 
-## Generate Text
+## Chat Interface
 
+### Running the Chat
+
+To start the chat interface, run:
+
+```bash
+python -m gptfast.chat
+```
+
+### Available Commands
+
+The chat interface supports the following commands:
+
+- `help` - Display all available commands
+- `quit` - Exit the chat
+- `reset` - Clear the chat history
+- `image` - Start a chat with an image (supports local paths and URLs)
+
+### Examples
+
+Basic chat:
+```bash
+You: Hello! Who are you?
+Assistant: I am Aria, an AI assistant...
+
+You: What can you help me with?
+Assistant: I can help you with various tasks...
+```
+
+Chat with images:
 ```bash
-python generate.py checkpoints/rhymes-ai/Aria/model.pth --compile --apply_regional_compilation --prompt "What is the meaning of life?"
+You: image
+Enter image path or URL: https://example.com/cat.jpg
+Enter your message about the image: What do you see in this image?
+Assistant: I can see a cat...
 ```

gptfast/chat.py

@@ -0,0 +1,121 @@
+from typing import List, Optional
+
+import requests
+from generate import GenerationConfig, Generator, ModelConfig
+from PIL import Image
+
+
+class ChatMessage:
+    def __init__(self, role: str, content: str, image_path: Optional[str] = None):
+        self.role = role
+        self.content = content
+        self.image_path = image_path
+
+
+class AriaChat:
+    def __init__(self, model_config: ModelConfig, generation_config: GenerationConfig):
+        self.generator = Generator(model_config, generation_config)
+        self.history: List[ChatMessage] = []
+
+    def add_message(self, role: str, content: str, image_path: Optional[str] = None):
+        """Add a message to the chat history."""
+        self.history.append(ChatMessage(role, content, image_path))
+
+    def format_prompt(self) -> tuple[str, Optional[str]]:
+        """Format the chat history into a prompt for the model."""
+        messages = []
+        images = []
+        for msg in self.history:
+            content = []
+            if msg.image_path:
+                content.append({"text": None, "type": "image"})
+                images.append(msg.image_path)
+            content.append({"text": msg.content, "type": "text"})
+            messages.append({"role": msg.role, "content": content})
+
+        processed_images = []
+        for image in images:
+            if isinstance(image, str):
+                if image.startswith("http://") or image.startswith("https://"):
+                    image = Image.open(requests.get(image, stream=True).raw)
+                else:
+                    image = Image.open(image)
+                image = image.convert("RGB")
+            processed_images.append(image)
+        return messages, processed_images
+
+    def chat(self, message: str, image_path: Optional[str] = None) -> str:
+        """Send a message and get a response."""
+        self.add_message("user", message, image_path)
+        messages, image = self.format_prompt()
+
+        response = self.generator.generate(messages, image)
+
+        # Extract the assistant's response from the full generated text
+        assistant_message = response.split("<|assistant|>")[-1].strip()
+        # Remove the end token if present
+        for stop_string in self.generator.generation_config.stop_strings:
+            assistant_message = assistant_message.replace(stop_string, "").strip()
+
+        self.add_message("assistant", assistant_message)
+        return assistant_message
+
+    def reset(self):
+        """Clear the chat history."""
+        self.history = []
+
+
+if __name__ == "__main__":
+    from pathlib import Path
+
+    from gptfast.chat import AriaChat
+    from gptfast.generate import GenerationConfig, ModelConfig
+
+    model_config = ModelConfig(
+        checkpoint_path=Path("checkpoints/rhymes-ai/Aria/model.pth"),
+        compile=True,
+    )
+    generation_config = GenerationConfig(
+        max_new_tokens=4096,
+        top_k=40,
+        temperature=0.8,
+        cache_size=8192,
+    )
+
+    chat = AriaChat(model_config, generation_config)
+
+    # Add welcome message and command instructions
+    print("\n=== AriaChat Terminal Interface ===")
+    print("\nAvailable commands:")
+    print("  'help'    - Show this help message")
+    print("  'quit'    - Exit the chat")
+    print("  'reset'   - Clear chat history")
+    print("  'image'   - Chat with an image")
+    print("\nType your message or command to begin...")
+
+    while True:
+        user_input = input("\n> You: ").strip()
+
+        if user_input.lower() == "quit":
+            break
+        elif user_input.lower() == "help":
+            print("\nAvailable commands:")
+            print("  'help'    - Show this help message")
+            print("  'quit'    - Exit the chat")
+            print("  'reset'   - Clear chat history")
+            print("  'image'   - Chat with an image")
+            continue
+        elif user_input.lower() == "reset":
+            chat.reset()
+            print("Chat history cleared.")
+            continue
+        elif user_input.lower() == "image":
+            image_path = input("Enter image path or URL: ").strip()
+            message = input("Enter your message about the image: ").strip()
+            response = chat.chat(message, image_path)
+        else:
+            response = chat.chat(user_input)
+
+        print(f"\n> Aria: {response}")
+
+    print("\nGoodbye!")

gptfast/generate.py

@@ -1,6 +1,7 @@
 # Copyright (c) Meta Platforms, Inc. and affiliates.
 # All rights reserved.
 
+import random
 import sys
 import time
 from pathlib import Path
@@ -13,7 +14,7 @@
 from model import Aria, ModelArgs, Transformer, prepare_inputs_for_model
 from PIL import Image
 from torch.nn.attention import SDPBackend
-from transformers import AutoProcessor, AutoTokenizer
+from transformers import AutoProcessor
 
 
 def device_sync(device):
@@ -172,7 +173,7 @@ def generate(
         **sampling_kwargs,
     )
 
-    seq = torch.cat((seq[: T + 1], *generated_tokens))
+    seq = torch.cat(generated_tokens)
 
     return seq
 
@@ -206,7 +207,7 @@ def recommended_inductor_config_setter():
     torch.set_float32_matmul_precision("high")
 
 
-def load_model_and_tokenizer(checkpoint_path, device, precision):
+def load_model_and_processor(checkpoint_path, device, precision):
     print(f"Using device={device}")
     print("Loading model ...")
     t0 = time.time()
@@ -216,67 +217,34 @@ def load_model_and_tokenizer(checkpoint_path, device, precision):
     print(f"Time to load model: {time.time() - t0:.02f} seconds")
 
     tokenizer_path = checkpoint_path.parent
-    tokenizer = AutoTokenizer.from_pretrained(
-        tokenizer_path, use_fast=False, trust_remote_code=True
-    )
     processor = AutoProcessor.from_pretrained(tokenizer_path, trust_remote_code=True)
 
-    return model, tokenizer, processor
-
-
-def prepare_image_inputs(image_path, prompt, processor, precision):
-    messages = [
-        {
-            "role": "user",
-            "content": [
-                {"text": None, "type": "image"},
-                {"text": prompt, "type": "text"},
-            ],
-        }
-    ]
-
-    image = Image.open(
-        requests.get(image_path, stream=True).raw
-        if image_path.startswith(("http://", "https://"))
-        else image_path
-    )
-
-    text = processor.apply_chat_template(messages, add_generation_prompt=True)
-    inputs = processor(text=text, images=image, return_tensors="pt")
-    del inputs["attention_mask"]
-    inputs["pixel_values"] = inputs["pixel_values"].to(precision)
-    return inputs
-
-
-def prepare_text_inputs(prompt, tokenizer):
-    messages = [{"role": "user", "content": [{"text": prompt, "type": "text"}]}]
-    text = tokenizer.apply_chat_template(
-        messages, tokenize=False, add_generation_prompt=True
-    )
-    return {
-        "input_ids": tokenizer(text, return_tensors="pt").input_ids.to(torch.int32),
-        "pixel_values": None,
-        "pixel_mask": None,
-    }
+    return model, processor
 
 
 def setup_model_compilation(
-    model, compile, compile_prefill, apply_regional_compilation
+    model, compile, compile_prefill, apply_regional_compilation, device
 ):
+    print("Compiling model...")
+    t0 = time.time()
     if apply_regional_compilation:
-        print("Compiling Model")
         for layer in model.llm.layers:
             layer.compile()
 
     if compile:
-        print("Compiling Model")
         global decode_one_token, prefill
         decode_one_token = torch.compile(
             decode_one_token, mode="reduce-overhead", fullgraph=True
         )
         if compile_prefill:
             prefill = torch.compile(prefill, fullgraph=True, dynamic=True)
 
+    # warmup
+    for _ in range(3):
+        input_ids = torch.tensor([1] * random.randint(10, 100), device=device)
+        generate(model, input_ids=torch.tensor([1], device=device), max_new_tokens=5)
+    print(f"Compilation done in {time.time() - t0:.02f} seconds")
+
 
 class GenerationConfig:
     """Configuration class for text generation parameters."""
@@ -325,14 +293,13 @@ def __init__(self, model_config: ModelConfig, generation_config: GenerationConfi
         self.model_config = model_config
         self.generation_config = generation_config
         self.model = None
-        self.tokenizer = None
         self.processor = None
 
         self._setup_model()
 
     def _setup_model(self):
         """Initialize model, tokenizer and processor."""
-        self.model, self.tokenizer, self.processor = load_model_and_tokenizer(
+        self.model, self.processor = load_model_and_processor(
             self.model_config.checkpoint_path,
             self.model_config.device,
             self.model_config.precision,
@@ -342,28 +309,29 @@ def _setup_model(self):
             self.model_config.compile,
             self.model_config.compile_prefill,
             self.model_config.apply_regional_compilation,
+            self.model_config.device,
         )
 
-    def generate(self, prompt: str, image_path: Optional[str] = None) -> str:
-        """Generate text from prompt and optional image."""
-        inputs = (
-            prepare_image_inputs(
-                image_path, prompt, self.processor, self.model_config.precision
-            )
-            if image_path
-            else prepare_text_inputs(prompt, self.tokenizer)
-        )
-        inputs = {
-            k: v.to(self.model_config.device) if v is not None else v
-            for k, v in inputs.items()
-        }
+    def generate(
+        self, messages: list[dict], image: Optional[Image.Image] = None
+    ) -> str:
+        text = self.processor.apply_chat_template(messages, add_generation_prompt=True)
+        inputs = self.processor(text=text, images=image, return_tensors="pt")
+        del inputs["attention_mask"]
+        for k, v in inputs.items():
+            if k == "pixel_values":
+                inputs[k] = v.to(self.model_config.precision).to(
+                    self.model_config.device
+                )
+            else:
+                inputs[k] = v.to(self.model_config.device)
 
         def early_stop_generation(tokens):
             # This is not efficient, but it works
             for stop_string in self.generation_config.stop_strings:
 
                 token_list = torch.cat(tokens)
-                decoded_string = self.tokenizer.decode(token_list)
+                decoded_string = self.processor.tokenizer.decode(token_list)
                 if decoded_string.endswith(stop_string):
                     return True
             return False
@@ -379,7 +347,7 @@ def early_stop_generation(tokens):
             callback=early_stop_generation,
         )
 
-        return self.tokenizer.decode(output)
+        return self.processor.tokenizer.decode(output)
 
 
 if __name__ == "__main__":
@@ -394,4 +362,14 @@ def early_stop_generation(tokens):
     generator = Generator(model_config, generation_config)
 
     image_path = "https://huggingface.co/datasets/huggingface/documentation-images/resolve/main/diffusers/cat.png"
-    print(generator.generate("describe the image", image_path))
+    image = Image.open(requests.get(image_path, stream=True).raw)
+    messages = [
+        {
+            "role": "user",
+            "content": [
+                {"text": None, "type": "image"},
+                {"text": "describe the image", "type": "text"},
+            ],
+        },
+    ]
+    print(generator.generate(messages, image))