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| 1 | + # Templates | ||
| 2 | + | ||
| 3 | + This document provides a comprehensive guide to the integration of Jinja2 templating into the `llama-cpp-python` project, with a focus on enhancing the chat functionality of the `llama-2` model. | ||
| 4 | + | ||
| 5 | + ## Introduction | ||
| 6 | + | ||
| 7 | + - Brief explanation of the `llama-cpp-python` project's need for a templating system. | ||
| 8 | + - Overview of the `llama-2` model's interaction with templating. | ||
| 9 | + | ||
| 10 | + ## Jinja2 Dependency Integration | ||
| 11 | + | ||
| 12 | + - Rationale for choosing Jinja2 as the templating engine. | ||
| 13 | + - Compatibility with Hugging Face's `transformers`. | ||
| 14 | + - Desire for advanced templating features and simplicity. | ||
| 15 | + - Detailed steps for adding `jinja2` to `pyproject.toml` for dependency management. | ||
| 16 | + | ||
| 17 | + ## Template Management Refactor | ||
| 18 | + | ||
| 19 | + - Summary of the refactor and the motivation behind it. | ||
| 20 | + - Description of the new chat handler selection logic: | ||
| 21 | + 1. Preference for a user-specified `chat_handler`. | ||
| 22 | + 2. Fallback to a user-specified `chat_format`. | ||
| 23 | + 3. Defaulting to a chat format from a `.gguf` file if available. | ||
| 24 | + 4. Utilizing the `llama2` default chat format as the final fallback. | ||
| 25 | + - Ensuring backward compatibility throughout the refactor. | ||
| 26 | + | ||
| 27 | + ## Implementation Details | ||
| 28 | + | ||
| 29 | + - In-depth look at the new `AutoChatFormatter` class. | ||
| 30 | + - Example code snippets showing how to utilize the Jinja2 environment and templates. | ||
| 31 | + - Guidance on how to provide custom templates or use defaults. | ||
| 32 | + | ||
| 33 | + ## Testing and Validation | ||
| 34 | + | ||
| 35 | + - Outline of the testing strategy to ensure seamless integration. | ||
| 36 | + - Steps for validating backward compatibility with existing implementations. | ||
| 37 | + | ||
| 38 | + ## Benefits and Impact | ||
| 39 | + | ||
| 40 | + - Analysis of the expected benefits, including consistency, performance gains, and improved developer experience. | ||
| 41 | + - Discussion of the potential impact on current users and contributors. | ||
| 42 | + | ||
| 43 | + ## Future Work | ||
| 44 | + | ||
| 45 | + - Exploration of how templating can evolve within the project. | ||
| 46 | + - Consideration of additional features or optimizations for the templating engine. | ||
| 47 | + - Mechanisms for community feedback on the templating system. | ||
| 48 | + | ||
| 49 | + ## Conclusion | ||
| 50 | + | ||
| 51 | + - Final thoughts on the integration of Jinja2 templating. | ||
| 52 | + - Call to action for community involvement and feedback. | ||
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| 1 | + """ | ||
| 2 | + llama_cpp/llama_jinja_format.py | ||
| 3 | + """ | ||
| 4 | + import dataclasses | ||
| 5 | + from typing import Any, Callable, Dict, List, Optional, Protocol, Union | ||
| 6 | + | ||
| 7 | + import jinja2 | ||
| 8 | + from jinja2 import Template | ||
| 9 | + | ||
| 10 | + # NOTE: We sacrifice readability for usability. | ||
| 11 | + # It will fail to work as expected if we attempt to format it in a readable way. | ||
| 12 | + llama2_template = """{% for message in messages %}{% if message['role'] == 'user' %}[INST] {{ message['content'] }} [/INST]\n{% elif message['role'] == 'assistant' %}{{ message['content'] }}\n{% elif message['role'] == 'system' %}<<SYS>> {{ message['content'] }} <</SYS>>\n{% endif %}{% endfor %}""" | ||
| 13 | + | ||
| 14 | + | ||
| 15 | + class MetaSingleton(type): | ||
| 16 | + """ | ||
| 17 | + Metaclass for implementing the Singleton pattern. | ||
| 18 | + """ | ||
| 19 | + | ||
| 20 | + _instances = {} | ||
| 21 | + | ||
| 22 | + def __call__(cls, *args, **kwargs): | ||
| 23 | + if cls not in cls._instances: | ||
| 24 | + cls._instances[cls] = super(MetaSingleton, cls).__call__(*args, **kwargs) | ||
| 25 | + return cls._instances[cls] | ||
| 26 | + | ||
| 27 | + | ||
| 28 | + class Singleton(object, metaclass=MetaSingleton): | ||
| 29 | + """ | ||
| 30 | + Base class for implementing the Singleton pattern. | ||
| 31 | + """ | ||
| 32 | + | ||
| 33 | + def __init__(self): | ||
| 34 | + super(Singleton, self).__init__() | ||
| 35 | + | ||
| 36 | + | ||
| 37 | + @dataclasses.dataclass | ||
| 38 | + class ChatFormatterResponse: | ||
| 39 | + prompt: str | ||
| 40 | + stop: Optional[Union[str, List[str]]] = None | ||
| 41 | + | ||
| 42 | + | ||
| 43 | + # Base Chat Formatter Protocol | ||
| 44 | + class ChatFormatterInterface(Protocol): | ||
| 45 | + def __init__(self, template: Optional[object] = None): | ||
| 46 | + ... | ||
| 47 | + | ||
| 48 | + def __call__( | ||
| 49 | + self, | ||
| 50 | + messages: List[Dict[str, str]], | ||
| 51 | + **kwargs, | ||
| 52 | + ) -> ChatFormatterResponse: | ||
| 53 | + ... | ||
| 54 | + | ||
| 55 | + @property | ||
| 56 | + def template(self) -> str: | ||
| 57 | + ... | ||
| 58 | + | ||
| 59 | + | ||
| 60 | + class AutoChatFormatter(ChatFormatterInterface): | ||
| 61 | + def __init__( | ||
| 62 | + self, | ||
| 63 | + template: Optional[str] = None, | ||
| 64 | + template_class: Optional[Template] = None, | ||
| 65 | + ): | ||
| 66 | + if template is not None: | ||
| 67 | + self._template = template | ||
| 68 | + else: | ||
| 69 | + self._template = llama2_template # default template | ||
| 70 | + | ||
| 71 | + self._environment = jinja2.Environment( | ||
| 72 | + loader=jinja2.BaseLoader(), | ||
| 73 | + trim_blocks=True, | ||
| 74 | + lstrip_blocks=True, | ||
| 75 | + ).from_string( | ||
| 76 | + self._template, | ||
| 77 | + template_class=template_class, | ||
| 78 | + ) | ||
| 79 | + | ||
| 80 | + def __call__( | ||
| 81 | + self, | ||
| 82 | + messages: List[Dict[str, str]], | ||
| 83 | + **kwargs: Any, | ||
| 84 | + ) -> ChatFormatterResponse: | ||
| 85 | + formatted_sequence = self._environment.render(messages=messages, **kwargs) | ||
| 86 | + return ChatFormatterResponse(prompt=formatted_sequence) | ||
| 87 | + | ||
| 88 | + @property | ||
| 89 | + def template(self) -> str: | ||
| 90 | + return self._template | ||
| 91 | + | ||
| 92 | + | ||
| 93 | + class FormatterNotFoundException(Exception): | ||
| 94 | + pass | ||
| 95 | + | ||
| 96 | + | ||
| 97 | + class ChatFormatterFactory(Singleton): | ||
| 98 | + _chat_formatters: Dict[str, Callable[[], ChatFormatterInterface]] = {} | ||
| 99 | + | ||
| 100 | + def register_formatter( | ||
| 101 | + self, | ||
| 102 | + name: str, | ||
| 103 | + formatter_callable: Callable[[], ChatFormatterInterface], | ||
| 104 | + overwrite=False, | ||
| 105 | + ): | ||
| 106 | + if not overwrite and name in self._chat_formatters: | ||
| 107 | + raise ValueError( | ||
| 108 | + f"Formatter with name '{name}' is already registered. Use `overwrite=True` to overwrite it." | ||
| 109 | + ) | ||
| 110 | + self._chat_formatters[name] = formatter_callable | ||
| 111 | + | ||
| 112 | + def unregister_formatter(self, name: str): | ||
| 113 | + if name in self._chat_formatters: | ||
| 114 | + del self._chat_formatters[name] | ||
| 115 | + else: | ||
| 116 | + raise ValueError(f"No formatter registered under the name '{name}'.") | ||
| 117 | + | ||
| 118 | + def get_formatter_by_name(self, name: str) -> ChatFormatterInterface: | ||
| 119 | + try: | ||
| 120 | + formatter_callable = self._chat_formatters[name] | ||
| 121 | + return formatter_callable() | ||
| 122 | + except KeyError: | ||
| 123 | + raise FormatterNotFoundException( | ||
| 124 | + f"Invalid chat format: {name} (valid formats: {list(self._chat_formatters.keys())})" | ||
| 125 | + ) | ||
| 126 | + | ||
| 127 | + | ||
| 128 | + # Define a chat format class | ||
| 129 | + class Llama2Formatter(AutoChatFormatter): | ||
| 130 | + def __init__(self): | ||
| 131 | + super().__init__(llama2_template) | ||
| 132 | + | ||
| 133 | + | ||
| 134 | + # With the Singleton pattern applied, regardless of where or how many times | ||
| 135 | + # ChatFormatterFactory() is called, it will always return the same instance | ||
| 136 | + # of the factory, ensuring that the factory's state is consistent throughout | ||
| 137 | + # the application. | ||
| 138 | + ChatFormatterFactory().register_formatter("llama-2", Llama2Formatter) | ||
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@@ -11,10 +11,13 @@ license = { text = "MIT" } | |||
| 11 | 11 | authors = [ | |
| 12 | 12 | { name = "Andrei Betlen", email = "abetlen@gmail.com" }, | |
| 13 | 13 | ] | |
| 14 | + # mkdocs-martiral requires "jinja2~=3.0" | ||
| 15 | + # transformers requires "jinja2>=2.11.3" | ||
| 14 | 16 | dependencies = [ | |
| 15 | 17 | "typing-extensions>=4.5.0", | |
| 16 | 18 | "numpy>=1.20.0", | |
| 17 | 19 | "diskcache>=5.6.1", | |
| 20 | + "jinja2>=2.11.3", | ||
| 18 | 21 | ] | |
| 19 | 22 | requires-python = ">=3.8" | |
| 20 | 23 | classifiers = [ | |
@@ -72,4 +75,3 @@ Changelog = "https://llama-cpp-python.readthedocs.io/en/latest/changelog/" | |||
| 72 | 75 | ||
| 73 | 76 | [tool.pytest.ini_options] | |
| 74 | 77 | addopts = "--ignore=vendor" | |
| 75 | - | ||
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| 1 | + from typing import List | ||
| 2 | + | ||
| 3 | + import pytest | ||
| 4 | + | ||
| 5 | + from llama_cpp import ChatCompletionMessage | ||
| 6 | + from llama_cpp.llama_jinja_format import Llama2Formatter | ||
| 7 | + | ||
| 8 | + | ||
| 9 | + @pytest.fixture | ||
| 10 | + def sequence_of_messages() -> List[ChatCompletionMessage]: | ||
| 11 | + return [ | ||
| 12 | + ChatCompletionMessage(role="system", content="Welcome to CodeHelp Bot!"), | ||
| 13 | + ChatCompletionMessage( | ||
| 14 | + role="user", content="Hi there! I need some help with Python." | ||
| 15 | + ), | ||
| 16 | + ChatCompletionMessage( | ||
| 17 | + role="assistant", content="Of course! What do you need help with in Python?" | ||
| 18 | + ), | ||
| 19 | + ChatCompletionMessage( | ||
| 20 | + role="user", | ||
| 21 | + content="I'm trying to write a function to find the factorial of a number, but I'm stuck.", | ||
| 22 | + ), | ||
| 23 | + ChatCompletionMessage( | ||
| 24 | + role="assistant", | ||
| 25 | + content="I can help with that! Would you like a recursive or iterative solution?", | ||
| 26 | + ), | ||
| 27 | + ChatCompletionMessage( | ||
| 28 | + role="user", content="Let's go with a recursive solution." | ||
| 29 | + ), | ||
| 30 | + ] | ||
| 31 | + | ||
| 32 | + | ||
| 33 | + def test_llama2_formatter(sequence_of_messages): | ||
| 34 | + expected_prompt = ( | ||
| 35 | + "<<SYS>> Welcome to CodeHelp Bot! <</SYS>>\n" | ||
| 36 | + "[INST] Hi there! I need some help with Python. [/INST]\n" | ||
| 37 | + "Of course! What do you need help with in Python?\n" | ||
| 38 | + "[INST] I'm trying to write a function to find the factorial of a number, but I'm stuck. [/INST]\n" | ||
| 39 | + "I can help with that! Would you like a recursive or iterative solution?\n" | ||
| 40 | + "[INST] Let's go with a recursive solution. [/INST]\n" | ||
| 41 | + ) | ||
| 42 | + | ||
| 43 | + llama2_formatter_instance = Llama2Formatter() | ||
| 44 | + formatter_response = llama2_formatter_instance(sequence_of_messages) | ||
| 45 | + assert ( | ||
| 46 | + expected_prompt == formatter_response.prompt | ||
| 47 | + ), "The formatted prompt does not match the expected output." | ||
| 48 | + | ||
| 49 | + | ||
| 50 | + # Optionally, include a test for the 'stop' if it's part of the functionality. | ||
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