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# 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.
import json
import os
from typing import TYPE_CHECKING, Dict, Generator, List, Optional, Sequence, Tuple
from numpy.typing import NDArray
from ..chat import ChatModel
from ..data import Role
from ..extras.constants import PEFT_METHODS
from ..extras.misc import torch_gc
from ..extras.packages import is_gradio_available
from .common import get_save_dir
from .locales import ALERTS
if TYPE_CHECKING:
from ..chat import BaseEngine
from .manager import Manager
if is_gradio_available():
import gradio as gr
class WebChatModel(ChatModel):
def __init__(self, manager: "Manager", demo_mode: bool = False, lazy_init: bool = True) -> None:
self.manager = manager
self.demo_mode = demo_mode
self.engine: Optional["BaseEngine"] = None
if not lazy_init: # read arguments from command line
super().__init__()
if demo_mode and os.environ.get("DEMO_MODEL") and os.environ.get("DEMO_TEMPLATE"): # load demo model
model_name_or_path = os.environ.get("DEMO_MODEL")
template = os.environ.get("DEMO_TEMPLATE")
infer_backend = os.environ.get("DEMO_BACKEND", "huggingface")
super().__init__(
dict(model_name_or_path=model_name_or_path, template=template, infer_backend=infer_backend)
)
@property
def loaded(self) -> bool:
return self.engine is not None
def load_model(self, data) -> Generator[str, None, None]:
get = lambda elem_id: data[self.manager.get_elem_by_id(elem_id)]
lang, model_name, model_path = get("top.lang"), get("top.model_name"), get("top.model_path")
finetuning_type, checkpoint_path = get("top.finetuning_type"), get("top.checkpoint_path")
error = ""
if self.loaded:
error = ALERTS["err_exists"][lang]
elif not model_name:
error = ALERTS["err_no_model"][lang]
elif not model_path:
error = ALERTS["err_no_path"][lang]
elif self.demo_mode:
error = ALERTS["err_demo"][lang]
if error:
gr.Warning(error)
yield error
return
yield ALERTS["info_loading"][lang]
args = dict(
model_name_or_path=model_path,
finetuning_type=finetuning_type,
quantization_bit=int(get("top.quantization_bit")) if get("top.quantization_bit") in ["8", "4"] else None,
template=get("top.template"),
flash_attn="fa2" if get("top.booster") == "flashattn2" else "auto",
use_unsloth=(get("top.booster") == "unsloth"),
visual_inputs=get("top.visual_inputs"),
rope_scaling=get("top.rope_scaling") if get("top.rope_scaling") in ["linear", "dynamic"] else None,
infer_backend=get("infer.infer_backend"),
)
if checkpoint_path:
if finetuning_type in PEFT_METHODS: # list
args["adapter_name_or_path"] = ",".join(
[get_save_dir(model_name, finetuning_type, adapter) for adapter in checkpoint_path]
)
else: # str
args["model_name_or_path"] = get_save_dir(model_name, finetuning_type, checkpoint_path)
super().__init__(args)
yield ALERTS["info_loaded"][lang]
def unload_model(self, data) -> Generator[str, None, None]:
lang = data[self.manager.get_elem_by_id("top.lang")]
if self.demo_mode:
gr.Warning(ALERTS["err_demo"][lang])
yield ALERTS["err_demo"][lang]
return
yield ALERTS["info_unloading"][lang]
self.engine = None
torch_gc()
yield ALERTS["info_unloaded"][lang]
def append(
self,
chatbot: List[List[Optional[str]]],
messages: Sequence[Dict[str, str]],
role: str,
query: str,
) -> Tuple[List[List[Optional[str]]], List[Dict[str, str]], str]:
return chatbot + [[query, None]], messages + [{"role": role, "content": query}], ""
def stream(
self,
chatbot: List[List[Optional[str]]],
messages: Sequence[Dict[str, str]],
system: str,
tools: str,
image: Optional[NDArray],
max_new_tokens: int,
top_p: float,
temperature: float,
) -> Generator[Tuple[List[List[Optional[str]]], List[Dict[str, str]]], None, None]:
chatbot[-1][1] = ""
response = ""
for new_text in self.stream_chat(
messages, system, tools, image, max_new_tokens=max_new_tokens, top_p=top_p, temperature=temperature
):
response += new_text
if tools:
result = self.engine.template.format_tools.extract(response)
else:
result = response
if isinstance(result, tuple):
name, arguments = result
arguments = json.loads(arguments)
tool_call = json.dumps({"name": name, "arguments": arguments}, ensure_ascii=False)
output_messages = messages + [{"role": Role.FUNCTION.value, "content": tool_call}]
bot_text = "```json\n" + tool_call + "\n```"
else:
output_messages = messages + [{"role": Role.ASSISTANT.value, "content": result}]
bot_text = result
chatbot[-1][1] = bot_text
yield chatbot, output_messages
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