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IBM watsonx.ai

WatsonxLLM 是 IBM watsonx.ai 基础模型的封装。

该示例展示了如何使用 LangChainwatsonx.ai 模型进行通信。

概览

集成细节

Class本地序列化JS支持Package downloadsPackage 最新版本
WatsonxLLMlangchain-ibmPyPI - DownloadsPyPI - Version

设置

要访问IBM watsonx.ai模型,您需要创建一个IBM watsonx.ai账户、获取API密钥,并安装langchain-ibm集成包。

Credentials

以下单元格定义了与watsonx基础模型推理工作所需的凭证。

操作: 提供IBM Cloud用户API密钥。详情请参见 管理用户API密钥

import os
from getpass import getpass

watsonx_api_key = getpass()
os.environ["WATSONX_APIKEY"] = watsonx_api_key

您还可以通过环境变量传递额外的密钥。

import os

os.environ["WATSONX_URL"] = "your service instance url"
os.environ["WATSONX_TOKEN"] = "your token for accessing the CPD cluster"
os.environ["WATSONX_PASSWORD"] = "your password for accessing the CPD cluster"
os.environ["WATSONX_USERNAME"] = "your username for accessing the CPD cluster"
os.environ["WATSONX_INSTANCE_ID"] = "your instance_id for accessing the CPD cluster"

安装

The LangChain IBM集成位于langchain-ibm包中:

!pip install -qU langchain-ibm

Instantiation

您可能需要为不同的模型或任务调整模型 parameters。有关详细信息,请参阅文档

parameters = {
"decoding_method": "sample",
"max_new_tokens": 100,
"min_new_tokens": 1,
"temperature": 0.5,
"top_k": 50,
"top_p": 1,
}

使用先前设置的参数初始化 WatsonxLLM 类。

注意:

  • 要为 API 调用提供上下文,请必须添加 project_idspace_id。如需更多信息,请参见 文档
  • 根据您已配置的服务实例所在区域,使用此处描述的其中一个网址。

在本示例中,我们将使用project_id和达拉斯的URL。

您需要指定用于推理的 model_id。所有可用模型您可以在文档中找到。

from langchain_ibm import WatsonxLLM

watsonx_llm = WatsonxLLM(
model_id="ibm/granite-13b-instruct-v2",
url="https://us-south.ml.cloud.ibm.com",
project_id="PASTE YOUR PROJECT_ID HERE",
params=parameters,
)
API 参考:WatsonxLLM

或者您可以使用 Cloud Pak for Data 凭据。有关详细信息,请参阅 文档

watsonx_llm = WatsonxLLM(
model_id="ibm/granite-13b-instruct-v2",
url="PASTE YOUR URL HERE",
username="PASTE YOUR USERNAME HERE",
password="PASTE YOUR PASSWORD HERE",
instance_id="openshift",
version="4.8",
project_id="PASTE YOUR PROJECT_ID HERE",
params=parameters,
)

除了 model_id,您还可以传入先前调优模型的 deployment_id。完整的模型调优工作流程在使用 TuneExperiment 和 PromptTuner中有所描述。

watsonx_llm = WatsonxLLM(
deployment_id="PASTE YOUR DEPLOYMENT_ID HERE",
url="https://us-south.ml.cloud.ibm.com",
project_id="PASTE YOUR PROJECT_ID HERE",
params=parameters,
)

对于某些需求,可以选择将IBM的APIClient对象传递给WatsonxLLM类。

from ibm_watsonx_ai import APIClient

api_client = APIClient(...)

watsonx_llm = WatsonxLLM(
model_id="ibm/granite-13b-instruct-v2",
watsonx_client=api_client,
)

您还可以将 IBM 的 ModelInference 对象传入 WatsonxLLM 类中。

from ibm_watsonx_ai.foundation_models import ModelInference

model = ModelInference(...)

watsonx_llm = WatsonxLLM(watsonx_model=model)

Invocation

要获取完成内容,可以直接使用字符串提示调用模型。

# Calling a single prompt

watsonx_llm.invoke("Who is man's best friend?")
"Man's best friend is his dog. Dogs are man's best friend because they are always there for you, they never judge you, and they love you unconditionally. Dogs are also great companions and can help reduce stress levels. "
# Calling multiple prompts

watsonx_llm.generate(
[
"The fastest dog in the world?",
"Describe your chosen dog breed",
]
)
LLMResult(generations=[[Generation(text='The fastest dog in the world is the greyhound. Greyhounds can run up to 45 mph, which is about the same speed as a Usain Bolt.', generation_info={'finish_reason': 'eos_token'})], [Generation(text='The Labrador Retriever is a breed of retriever that was bred for hunting. They are a very smart breed and are very easy to train. They are also very loyal and will make great companions. ', generation_info={'finish_reason': 'eos_token'})]], llm_output={'token_usage': {'generated_token_count': 82, 'input_token_count': 13}, 'model_id': 'ibm/granite-13b-instruct-v2', 'deployment_id': None}, run=[RunInfo(run_id=UUID('750b8a0f-8846-456d-93d0-e039e95b1276')), RunInfo(run_id=UUID('aa4c2a1c-5b08-4fcf-87aa-50228de46db5'))], type='LLMResult')

流式传输模型输出

您可以流式传输模型输出。

for chunk in watsonx_llm.stream(
"Describe your favorite breed of dog and why it is your favorite."
):
print(chunk, end="")
My favorite breed of dog is a Labrador Retriever. They are my favorite breed because they are my favorite color, yellow. They are also very smart and easy to train.

链式调用

创建 PromptTemplate 个对象,这些对象将负责生成一个随机问题。

from langchain_core.prompts import PromptTemplate

template = "Generate a random question about {topic}: Question: "

prompt = PromptTemplate.from_template(template)
API 参考:提示模板

提供一个主题并运行链。

llm_chain = prompt | watsonx_llm

topic = "dog"

llm_chain.invoke(topic)
'What is the origin of the name "Pomeranian"?'

API 参考

详细文档请参阅所有WatsonxLLM功能和配置的API参考