ChatPerplexity
此笔记本介绍了如何开始使用Perplexity聊天模型。
from langchain_community.chat_models import ChatPerplexity
from langchain_core.prompts import ChatPromptTemplate
API 参考：ChatPerplexity | ChatPromptTemplate
提供的代码假设您的 PPLX_API_KEY 已在您的环境变量中设置。如果您想手动指定您的 API 密钥并选择不同的模型，您可以使用以下代码
chat = ChatPerplexity(
temperature=0, pplx_api_key="YOUR_API_KEY", model="llama-3-sonar-small-32k-online"
)
提供的代码假设您的 PPLX_API_KEY 已在您的环境变量中设置。如果您想手动指定您的 API 密钥并选择不同的模型，您可以使用以下代码
chat = ChatPerplexity(temperature=0, pplx_api_key="YOUR_API_KEY", model="llama-3.1-sonar-small-128k-online")
您可以在此处查看可用模型列表。为了可重复性，我们可以在此笔记本中将其作为输入动态设置 API 密钥。
import os
from getpass import getpass
PPLX_API_KEY = getpass()
os.environ["PPLX_API_KEY"] = PPLX_API_KEY
chat = ChatPerplexity(temperature=0, model="llama-3.1-sonar-small-128k-online")
system = "You are a helpful assistant."
human = "{input}"
prompt = ChatPromptTemplate.from_messages([("system", system), ("human", human)])
chain = prompt | chat
response = chain.invoke({"input": "Why is the Higgs Boson important?"})
response.content
'The Higgs Boson is an elementary subatomic particle that plays a crucial role in the Standard Model of particle physics, which accounts for three of the four fundamental forces governing the behavior of our universe: the strong and weak nuclear forces, electromagnetism, and gravity. The Higgs Boson is important for several reasons:\n\n1. **Final Elementary Particle**: The Higgs Boson is the last elementary particle waiting to be discovered under the Standard Model. Its detection helps complete the Standard Model and further our understanding of the fundamental forces in the universe.\n\n2. **Mass Generation**: The Higgs Boson is responsible for giving mass to other particles, a process that occurs through its interaction with the Higgs field. This mass generation is essential for the formation of atoms, molecules, and the visible matter we observe in the universe.\n\n3. **Implications for New Physics**: While the detection of the Higgs Boson has confirmed many aspects of the Standard Model, it also opens up new possibilities for discoveries beyond the Standard Model. Further research on the Higgs Boson could reveal insights into the nature of dark matter, supersymmetry, and other exotic phenomena.\n\n4. **Advancements in Technology**: The search for the Higgs Boson has led to significant advancements in technology, such as the development of artificial intelligence and machine learning algorithms used in particle accelerators like the Large Hadron Collider (LHC). These advancements have not only contributed to the discovery of the Higgs Boson but also have potential applications in various other fields.\n\nIn summary, the Higgs Boson is important because it completes the Standard Model, plays a crucial role in mass generation, hints at new physics phenomena beyond the Standard Model, and drives advancements in technology.\n'
您可以像往常一样格式化和构造提示。在以下示例中，我们要求模型讲一个关于猫的笑话。
chat = ChatPerplexity(temperature=0, model="llama-3.1-sonar-small-128k-online")
prompt = ChatPromptTemplate.from_messages([("human", "Tell me a joke about {topic}")])
chain = prompt | chat
response = chain.invoke({"topic": "cats"})
response.content
'Here\'s a joke about cats:\n\nWhy did the cat want math lessons from a mermaid?\n\nBecause it couldn\'t find its "core purpose" in life!\n\nRemember, cats are unique and fascinating creatures, and each one has its own special traits and abilities. While some may see them as mysterious or even a bit aloof, they are still beloved pets that bring joy and companionship to their owners. So, if your cat ever seeks guidance from a mermaid, just remember that they are on their own journey to self-discovery!\n'
ChatPerplexity 还支持流功能：
chat = ChatPerplexity(temperature=0.7, model="llama-3.1-sonar-small-128k-online")
prompt = ChatPromptTemplate.from_messages(
[("human", "Give me a list of famous tourist attractions in Pakistan")]
)
chain = prompt | chat
for chunk in chain.stream({}):
print(chunk.content, end="", flush=True)
Here is a list of some famous tourist attractions in Pakistan:
1. **Minar-e-Pakistan**: A 62-meter high minaret in Lahore that represents the history of Pakistan.
2. **Badshahi Mosque**: A historic mosque in Lahore with a capacity of 10,000 worshippers.
3. **Shalimar Gardens**: A beautiful garden in Lahore with landscaped grounds and a series of cascading pools.
4. **Pakistan Monument**: A national monument in Islamabad representing the four provinces and three districts of Pakistan.
5. **National Museum of Pakistan**: A museum in Karachi showcasing the country's cultural history.
6. **Faisal Mosque**: A large mosque in Islamabad that can accommodate up to 300,000 worshippers.
7. **Clifton Beach**: A popular beach in Karachi offering water activities and recreational facilities.
8. **Kartarpur Corridor**: A visa-free border crossing and religious corridor connecting Gurdwara Darbar Sahib in Pakistan to Gurudwara Sri Kartarpur Sahib in India.
9. **Mohenjo-daro**: An ancient Indus Valley civilization site in Sindh, Pakistan, dating back to around 2500 BCE.
10. **Hunza Valley**: A picturesque valley in Gilgit-Baltistan known for its stunning mountain scenery and unique culture.
These attractions showcase the rich history, diverse culture, and natural beauty of Pakistan, making them popular destinations for both local and international tourists.