# Copyright 2024 the LlamaFactory team.
#
# 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.
from dataclasses import dataclass
from typing import TYPE_CHECKING, Dict, List, Optional, Sequence, Tuple, Union
from typing_extensions import override
from ..extras import logging
from ..extras.misc import check_version
from .data_utils import Role
from .formatter import EmptyFormatter, FunctionFormatter, StringFormatter, ToolFormatter
from .mm_plugin import get_mm_plugin
if TYPE_CHECKING:
from transformers import PreTrainedTokenizer
from ..hparams import DataArguments
from .formatter import SLOTS, Formatter
from .mm_plugin import BasePlugin
from .tool_utils import FunctionCall
logger = logging.get_logger(__name__)
@dataclass
class Template:
format_user: "Formatter"
format_assistant: "Formatter"
format_system: "Formatter"
format_function: "Formatter"
format_observation: "Formatter"
format_tools: "Formatter"
format_prefix: "Formatter"
default_system: str
stop_words: List[str]
efficient_eos: bool
replace_eos: bool
replace_jinja_template: bool
mm_plugin: "BasePlugin"
def encode_oneturn(
self,
tokenizer: "PreTrainedTokenizer",
messages: Sequence[Dict[str, str]],
system: Optional[str] = None,
tools: Optional[str] = None,
) -> Tuple[List[int], List[int]]:
r"""
Returns a single pair of token ids representing prompt and response respectively.
"""
encoded_messages = self._encode(tokenizer, messages, system, tools)
prompt_ids = []
for encoded_ids in encoded_messages[:-1]:
prompt_ids += encoded_ids
answer_ids = encoded_messages[-1]
return prompt_ids, answer_ids
def encode_multiturn(
self,
tokenizer: "PreTrainedTokenizer",
messages: Sequence[Dict[str, str]],
system: Optional[str] = None,
tools: Optional[str] = None,
) -> List[Tuple[List[int], List[int]]]:
r"""
Returns multiple pairs of token ids representing prompts and responses respectively.
"""
encoded_messages = self._encode(tokenizer, messages, system, tools)
return [(encoded_messages[i], encoded_messages[i + 1]) for i in range(0, len(encoded_messages), 2)]
def extract_tool(self, content: str) -> Union[str, List["FunctionCall"]]:
r"""
Extracts tool message.
"""
return self.format_tools.extract(content)
def _encode(
self,
tokenizer: "PreTrainedTokenizer",
messages: Sequence[Dict[str, str]],
system: Optional[str],
tools: Optional[str],
) -> List[List[int]]:
r"""
Encodes formatted inputs to pairs of token ids.
Turn 0: prefix + system + query resp
Turn t: sep + query resp
"""
system = system or self.default_system
encoded_messages = []
for i, message in enumerate(messages):
elements = []
if i == 0:
elements += self.format_prefix.apply()
if system or tools:
tool_text = self.format_tools.apply(content=tools)[0] if tools else ""
elements += self.format_system.apply(content=(system + tool_text))
if message["role"] == Role.USER.value:
elements += self.format_user.apply(content=message["content"], idx=str(i // 2))
elif message["role"] == Role.ASSISTANT.value:
elements += self.format_assistant.apply(content=message["content"])
elif message["role"] == Role.OBSERVATION.value:
elements += self.format_observation.apply(content=message["content"])
elif message["role"] == Role.FUNCTION.value:
elements += self.format_function.apply(content=message["content"])
else:
raise NotImplementedError("Unexpected role: {}".format(message["role"]))
encoded_messages.append(self._convert_elements_to_ids(tokenizer, elements))
return encoded_messages
def _convert_elements_to_ids(self, tokenizer: "PreTrainedTokenizer", elements: "SLOTS") -> List[int]:
r"""
Converts elements to token ids.
"""
token_ids = []
for elem in elements:
if isinstance(elem, str):
if len(elem) != 0:
token_ids += tokenizer.encode(elem, add_special_tokens=False)
elif isinstance(elem, dict):
token_ids += [tokenizer.convert_tokens_to_ids(elem.get("token"))]
elif isinstance(elem, set):
if "bos_token" in elem and tokenizer.bos_token_id is not None:
token_ids += [tokenizer.bos_token_id]
elif "eos_token" in elem and tokenizer.eos_token_id is not None:
token_ids += [tokenizer.eos_token_id]
else:
raise ValueError(f"Input must be string, set[str] or dict[str, str], got {type(elem)}")
return token_ids
@dataclass
class Llama2Template(Template):
@override
def _encode(
self,
tokenizer: "PreTrainedTokenizer",
messages: Sequence[Dict[str, str]],
system: str,
tools: str,
) -> List[List[int]]:
r"""
Encodes formatted inputs to pairs of token ids.
Turn 0: prefix + system + query resp
Turn t: sep + query resp
"""
system = system or self.default_system
encoded_messages = []
for i, message in enumerate(messages):
elements = []
system_text = ""
if i == 0:
elements += self.format_prefix.apply()
if system or tools:
tool_text = self.format_tools.apply(content=tools)[0] if tools else ""
system_text = self.format_system.apply(content=(system + tool_text))[0]
if message["role"] == Role.USER.value:
elements += self.format_user.apply(content=system_text + message["content"])
elif message["role"] == Role.ASSISTANT.value:
elements += self.format_assistant.apply(content=message["content"])
elif message["role"] == Role.OBSERVATION.value:
elements += self.format_observation.apply(content=message["content"])
elif message["role"] == Role.FUNCTION.value:
elements += self.format_function.apply(content=message["content"])
else:
raise NotImplementedError("Unexpected role: {}".format(message["role"]))
encoded_messages.append(self._convert_elements_to_ids(tokenizer, elements))
return encoded_messages
TEMPLATES: Dict[str, "Template"] = {}
def _register_template(
name: str,
format_user: Optional["Formatter"] = None,
format_assistant: Optional["Formatter"] = None,
format_system: Optional["Formatter"] = None,
format_function: Optional["Formatter"] = None,
format_observation: Optional["Formatter"] = None,
format_tools: Optional["Formatter"] = None,
format_prefix: Optional["Formatter"] = None,
default_system: str = "",
stop_words: Sequence[str] = [],
efficient_eos: bool = False,
replace_eos: bool = False,
replace_jinja_template: bool = False,
mm_plugin: "BasePlugin" = get_mm_plugin(name="base"),
) -> None:
r"""
Registers a chat template.
To add the following chat template:
```
user prompt here
model response here
user prompt here
model response here
```
The corresponding code should be:
```
_register_template(
name="custom",
format_user=StringFormatter(slots=["{{content}}\n"]),
format_assistant=StringFormatter(slots=["{{content}}\n"]),
format_prefix=EmptyFormatter(""),
)
```
"""
template_class = Llama2Template if any(k in name for k in ("llama2", "mistral", "pixtral")) else Template
default_slots = ["{{content}}"] if efficient_eos else ["{{content}}", {"eos_token"}]
default_user_formatter = StringFormatter(slots=["{{content}}"])
default_assistant_formatter = StringFormatter(slots=default_slots)
default_function_formatter = FunctionFormatter(slots=default_slots, tool_format="default")
default_tool_formatter = ToolFormatter(tool_format="default")
default_prefix_formatter = EmptyFormatter()
TEMPLATES[name] = template_class(
format_user=format_user or default_user_formatter,
format_assistant=format_assistant or default_assistant_formatter,
format_system=format_system or default_user_formatter,
format_function=format_function or default_function_formatter,
format_observation=format_observation or format_user or default_user_formatter,
format_tools=format_tools or default_tool_formatter,
format_prefix=format_prefix or default_prefix_formatter,
default_system=default_system,
stop_words=stop_words,
efficient_eos=efficient_eos,
replace_eos=replace_eos,
replace_jinja_template=replace_jinja_template,
mm_plugin=mm_plugin,
)
def _add_or_replace_eos_token(tokenizer: "PreTrainedTokenizer", eos_token: str) -> None:
is_added = tokenizer.eos_token_id is None
num_added_tokens = tokenizer.add_special_tokens({"eos_token": eos_token})
if is_added:
logger.info_rank0(f"Add eos token: {tokenizer.eos_token}")
else:
logger.info_rank0(f"Replace eos token: {tokenizer.eos_token}")
if num_added_tokens > 0:
logger.warning_rank0("New tokens have been added, make sure `resize_vocab` is True.")
def _jinja_escape(content: str) -> str:
return content.replace("'", r"\'")
def _convert_slots_to_jinja(slots: "SLOTS", tokenizer: "PreTrainedTokenizer", placeholder: str = "content") -> str:
slot_items = []
for slot in slots:
if isinstance(slot, str):
slot_pieces = slot.split("{{content}}")
if slot_pieces[0]:
slot_items.append("'" + _jinja_escape(slot_pieces[0]) + "'")
if len(slot_pieces) > 1:
slot_items.append(placeholder)
if slot_pieces[1]:
slot_items.append("'" + _jinja_escape(slot_pieces[1]) + "'")
elif isinstance(slot, set): # do not use {{ eos_token }} since it may be replaced
if "bos_token" in slot and tokenizer.bos_token_id is not None:
slot_items.append("'" + tokenizer.bos_token + "'")
elif "eos_token" in slot and tokenizer.eos_token_id is not None:
slot_items.append("'" + tokenizer.eos_token + "'")
elif isinstance(slot, dict):
raise ValueError("Dict is not supported.")
return " + ".join(slot_items)
def _get_jinja_template(template: "Template", tokenizer: "PreTrainedTokenizer") -> str:
r"""
Returns the jinja template.
"""
jinja_template = ""
prefix = _convert_slots_to_jinja(template.format_prefix.apply(), tokenizer)
if prefix:
jinja_template += "{{ " + prefix + " }}"
if template.default_system:
jinja_template += "{% set system_message = '" + _jinja_escape(template.default_system) + "' %}"
jinja_template += (
"{% if messages[0]['role'] == 'system' %}{% set loop_messages = messages[1:] %}"
"{% set system_message = messages[0]['content'] %}{% else %}{% set loop_messages = messages %}{% endif %}"
)
system_message = _convert_slots_to_jinja(template.format_system.apply(), tokenizer, placeholder="system_message")
if not isinstance(template, Llama2Template):
jinja_template += "{% if system_message is defined %}{{ " + system_message + " }}{% endif %}"
jinja_template += "{% for message in loop_messages %}"
jinja_template += "{% set content = message['content'] %}"
if isinstance(template, Llama2Template):
jinja_template += "{% if loop.index0 == 0 and system_message is defined %}"
jinja_template += "{% set content = " + system_message + " + message['content'] %}"
jinja_template += "{% endif %}"
jinja_template += "{% if message['role'] == 'user' %}"
user_message = _convert_slots_to_jinja(template.format_user.apply(), tokenizer)
jinja_template += "{{ " + user_message + " }}"
jinja_template += "{% elif message['role'] == 'assistant' %}"
assistant_message = _convert_slots_to_jinja(template.format_assistant.apply(), tokenizer)
jinja_template += "{{ " + assistant_message + " }}"
jinja_template += "{% endif %}"
jinja_template += "{% endfor %}"
return jinja_template
def get_template_and_fix_tokenizer(tokenizer: "PreTrainedTokenizer", data_args: "DataArguments") -> "Template":
r"""
Gets chat template and fixes the tokenizer.
"""
if data_args.template is None:
template = TEMPLATES["empty"] # placeholder
else:
template = TEMPLATES.get(data_args.template, None)
if template is None:
raise ValueError(f"Template {data_args.template} does not exist.")
if template.mm_plugin.__class__.__name__ != "BasePlugin":
check_version("transformers>=4.45.0")
if data_args.train_on_prompt and template.efficient_eos:
raise ValueError("Current template does not support `train_on_prompt`.")
if data_args.tool_format is not None:
logger.info_rank0(f"Using tool format: {data_args.tool_format}.")
default_slots = ["{{content}}"] if template.efficient_eos else ["{{content}}", {"eos_token"}]
template.format_function = FunctionFormatter(slots=default_slots, tool_format=data_args.tool_format)
template.format_tools = ToolFormatter(tool_format=data_args.tool_format)
stop_words = template.stop_words
if template.replace_eos:
if not stop_words:
raise ValueError("Stop words are required to replace the EOS token.")
_add_or_replace_eos_token(tokenizer, eos_token=stop_words[0])
stop_words = stop_words[1:]
if tokenizer.eos_token_id is None:
_add_or_replace_eos_token(tokenizer, eos_token="<|endoftext|>")
if tokenizer.pad_token_id is None:
tokenizer.pad_token = tokenizer.eos_token
logger.info_rank0(f"Add pad token: {tokenizer.pad_token}")
if stop_words:
num_added_tokens = tokenizer.add_special_tokens(
dict(additional_special_tokens=stop_words), replace_additional_special_tokens=False
)
logger.info_rank0("Add {} to stop words.".format(",".join(stop_words)))
if num_added_tokens > 0:
logger.warning_rank0("New tokens have been added, make sure `resize_vocab` is True.")
if tokenizer.chat_template is None or template.replace_jinja_template:
try:
tokenizer.chat_template = _get_jinja_template(template, tokenizer)
except ValueError as e:
logger.info_rank0(f"Cannot add this chat template to tokenizer: {e}.")
return template
_register_template(
name="alpaca",
format_user=StringFormatter(slots=["### Instruction:\n{{content}}\n\n### Response:\n"]),
format_assistant=StringFormatter(slots=["{{content}}", {"eos_token"}, "\n\n"]),
default_system=(
"Below is an instruction that describes a task. "
"Write a response that appropriately completes the request.\n\n"
),
replace_jinja_template=True,
)
_register_template(
name="aquila",
format_user=StringFormatter(slots=["Human: {{content}}###Assistant:"]),
format_assistant=StringFormatter(slots=["{{content}}###"]),
format_system=StringFormatter(slots=["System: {{content}}###"]),
default_system=(
"A chat between a curious human and an artificial intelligence assistant. "
"The assistant gives helpful, detailed, and polite answers to the human's questions."
),
stop_words=[""],
)
_register_template(
name="atom",
format_user=StringFormatter(
slots=[{"bos_token"}, "Human: {{content}}\n", {"eos_token"}, {"bos_token"}, "Assistant:"]
),
format_assistant=StringFormatter(slots=["{{content}}\n", {"eos_token"}]),
)
_register_template(
name="baichuan",
format_user=StringFormatter(slots=[{"token": ""}, "{{content}}", {"token": ""}]),
efficient_eos=True,
)
_register_template(
name="baichuan2",
format_user=StringFormatter(slots=["{{content}}"]),
efficient_eos=True,
)
_register_template(
name="belle",
format_user=StringFormatter(slots=["Human: {{content}}\n\nBelle: "]),
format_assistant=StringFormatter(slots=["{{content}}", {"eos_token"}, "\n\n"]),
format_prefix=EmptyFormatter(slots=[{"bos_token"}]),
)
_register_template(
name="bluelm",
format_user=StringFormatter(slots=[{"token": "[|Human|]:"}, "{{content}}", {"token": "[|AI|]:"}]),
)
_register_template(
name="breeze",
format_user=StringFormatter(slots=["[INST] {{content}} [/INST] "]),
format_prefix=EmptyFormatter(slots=[{"bos_token"}]),
efficient_eos=True,
)
_register_template(
name="chatglm2",
format_user=StringFormatter(slots=["[Round {{idx}}]\n\n问:{{content}}\n\n答:"]),
format_prefix=EmptyFormatter(slots=[{"token": "[gMASK]"}, {"token": "sop"}]),
efficient_eos=True,
)
_register_template(
name="chatglm3",
format_user=StringFormatter(slots=[{"token": "<|user|>"}, "\n", "{{content}}", {"token": "<|assistant|>"}]),
format_assistant=StringFormatter(slots=["\n", "{{content}}"]),
format_system=StringFormatter(slots=[{"token": "<|system|>"}, "\n", "{{content}}"]),
format_function=FunctionFormatter(slots=["{{content}}"], tool_format="glm4"),
format_observation=StringFormatter(
slots=[{"token": "<|observation|>"}, "\n", "{{content}}", {"token": "<|assistant|>"}]
),
format_tools=ToolFormatter(tool_format="glm4"),
format_prefix=EmptyFormatter(slots=[{"token": "[gMASK]"}, {"token": "sop"}]),
stop_words=["<|user|>", "<|observation|>"],
efficient_eos=True,
)
_register_template(
name="chatml",
format_user=StringFormatter(slots=["<|im_start|>user\n{{content}}<|im_end|>\n<|im_start|>assistant\n"]),
format_assistant=StringFormatter(slots=["{{content}}<|im_end|>\n"]),
format_system=StringFormatter(slots=["<|im_start|>system\n{{content}}<|im_end|>\n"]),
format_observation=StringFormatter(slots=["<|im_start|>tool\n{{content}}<|im_end|>\n<|im_start|>assistant\n"]),
stop_words=["<|im_end|>", "<|im_start|>"],
replace_eos=True,
replace_jinja_template=True,
)
# copied from chatml template
_register_template(
name="chatml_de",
format_user=StringFormatter(slots=["<|im_start|>user\n{{content}}<|im_end|>\n<|im_start|>assistant\n"]),
format_assistant=StringFormatter(slots=["{{content}}<|im_end|>\n"]),
format_system=StringFormatter(slots=["<|im_start|>system\n{{content}}<|im_end|>\n"]),
format_observation=StringFormatter(slots=["<|im_start|>tool\n{{content}}<|im_end|>\n<|im_start|>assistant\n"]),
default_system="Du bist ein freundlicher und hilfsbereiter KI-Assistent.",
stop_words=["<|im_end|>", "<|im_start|>"],
replace_eos=True,
replace_jinja_template=True,
)
_register_template(
name="codegeex2",
format_prefix=EmptyFormatter(slots=[{"token": "[gMASK]"}, {"token": "sop"}]),
)
_register_template(
name="codegeex4",
format_user=StringFormatter(slots=["<|user|>\n{{content}}<|assistant|>\n"]),
format_system=StringFormatter(slots=["<|system|>\n{{content}}"]),
format_function=FunctionFormatter(slots=["{{content}}"], tool_format="glm4"),
format_observation=StringFormatter(slots=["<|observation|>\n{{content}}<|assistant|>\n"]),
format_tools=ToolFormatter(tool_format="glm4"),
format_prefix=EmptyFormatter(slots=["[gMASK]"]),
default_system=(
"你是一位智能编程助手,你叫CodeGeeX。你会为用户回答关于编程、代码、计算机方面的任何问题,"
"并提供格式规范、可以执行、准确安全的代码,并在必要时提供详细的解释。"
),
stop_words=["<|user|>", "<|observation|>"],
efficient_eos=True,
)
_register_template(
name="cohere",
format_user=StringFormatter(
slots=[
(
"<|START_OF_TURN_TOKEN|><|USER_TOKEN|>{{content}}<|END_OF_TURN_TOKEN|>"
"<|START_OF_TURN_TOKEN|><|CHATBOT_TOKEN|>"
)
]
),
format_system=StringFormatter(slots=["<|START_OF_TURN_TOKEN|><|SYSTEM_TOKEN|>{{content}}<|END_OF_TURN_TOKEN|>"]),
format_prefix=EmptyFormatter(slots=[{"bos_token"}]),
)
_register_template(
name="cpm",
format_user=StringFormatter(slots=["<用户>{{content}}"]),
format_prefix=EmptyFormatter(slots=[{"bos_token"}]),
)
# copied from chatml template
_register_template(
name="cpm3",
format_user=StringFormatter(slots=["<|im_start|>user\n{{content}}<|im_end|>\n<|im_start|>assistant\n"]),
format_assistant=StringFormatter(slots=["{{content}}<|im_end|>\n"]),
format_system=StringFormatter(slots=["<|im_start|>system\n{{content}}<|im_end|>\n"]),
format_prefix=EmptyFormatter(slots=[{"bos_token"}]),
stop_words=["<|im_end|>"],
)
_register_template(
name="cpm_o",
format_user=StringFormatter(slots=["<|im_start|>user\n{{content}}<|im_end|>\n<|im_start|>assistant\n"]),
format_system=StringFormatter(slots=["<|im_start|>system\n{{content}}<|im_end|>\n"]),
format_function=FunctionFormatter(slots=["{{content}}", "<|im_end|>"], tool_format="qwen"),
format_observation=StringFormatter(
slots=["<|im_start|>user\n\n{{content}}\n<|im_end|>\n<|im_start|>assistant\n"]
),
format_tools=ToolFormatter(tool_format="qwen"),
format_separator=EmptyFormatter(slots=["\n"]),
default_system="You are a helpful assistant.",
stop_words=["<|im_end|>"],
mm_plugin=get_mm_plugin(name="cpm_o", image_token="", video_token="