跟踪Token使用情况

本笔记本介绍了如何跟踪特定调用的Token使用情况。目前仅针对OpenAI API实现。

首先，让我们看一个非常简单的示例，跟踪单个LLM调用的Token使用情况。

from langchain.llms import OpenAI  
from langchain.callbacks import get_openai_callback  

llm = OpenAI(model_name="text-davinci-002", n=2, best_of=2)  

with get_openai_callback() as cb:  
    result = llm("Tell me a joke")  
    print(cb)  

令牌使用情况如下：

Tokens Used: 42  
    Prompt Tokens: 4  
    Completion Tokens: 38  
Successful Requests: 1  
Total Cost (USD): $0.00084  

上下文管理器中的任何内容都将被跟踪。以下是使用它来跟踪连续多个调用的示例。

with get_openai_callback() as cb:  
    result = llm("Tell me a joke")  
    result2 = llm("Tell me a joke")  
    print(cb.total_tokens)  

Token使用情况为91。

如果使用具有多个步骤的链或代理，它将跟踪所有这些步骤。

from langchain.agents import load_tools  
from langchain.agents import initialize_agent  
from langchain.agents import AgentType  
from langchain.llms import OpenAI  

llm = OpenAI(temperature=0)  
tools = load_tools(["serpapi", "llm-math"], llm=llm)  
agent = initialize_agent(  
    tools, llm, agent=AgentType.ZERO_SHOT_REACT_DESCRIPTION, verbose=True  
)  

with get_openai_callback() as cb:  
    response = agent.run(  
        "Who is Olivia Wilde's boyfriend? What is his current age raised to the 0.23 power?"  
    )  
    print(f"Total Tokens: {cb.total_tokens}")  
    print(f"Prompt Tokens: {cb.prompt_tokens}")  
    print(f"Completion Tokens: {cb.completion_tokens}")  
    print(f"Total Cost (USD): ${cb.total_cost}")  

Token使用情况如下：

> Entering new AgentExecutor chain...  
 I need to find out who Olivia Wilde's boyfriend is and then calculate his age raised to the 0.23 power.  
Action: Search  
Action Input: "Olivia Wilde boyfriend"  
Observation: Sudeikis and Wilde's relationship ended in November 2020. Wilde was publicly served with court documents regarding child custody while she was presenting Don't Worry Darling at CinemaCon 2022. In January 2021, Wilde began dating singer Harry Styles after meeting during the filming of Don't Worry Darling.  
Thought: I need to find out Harry Styles' age.  
Action: Search  
Action Input: "Harry Styles age"  
Observation: 29 years  
Thought: I need to calculate 29 raised to the 0.23 power.  
Action: Calculator  
Action Input: 29^0.23  
Observation: Answer: 2.169459462491557  

Thought: I now know the final answer.  
Final Answer: Harry Styles, Olivia Wilde's boyfriend, is 29 years old and his age raised to the 0.23 power is 2.169459462491557.  

> Finished chain.  
Total Tokens: 1506  
Prompt Tokens: 1350  
Completion Tokens: 156  
Total Cost (USD): $0.03012