Understanding Langchain by building script generator

.gitignore

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+__pycache__

README.md

@@ -10,4 +10,32 @@ pinned: false
 license: mit
 ---
 
-Check out the configuration reference at https://huggingface.co/docs/hub/spaces-config-reference
+# First LangChain tutorial
+This is the first LangChain tutorial hands-on.
+It's a Youtube script generator using OpenAI LLM.
+It covers the following topics:
+* Streamlist for Web App development
+* LLMChain
+* PromptTemplate
+* SimpleSequentialChain
+* SequentialChain
+* ConversationalMemoryBuffer
+* WikipediaAPIWrapper
+
+
+### Pre-requisites
+
+    $ pip install openai langchain streamlit wikipedia chromadb tiktoken
+
+Or
+
+    $ pip install -r requirements.txt
+
+* Install the above Python packages
+* Replace the API key in the file `apikey.py` with your own OpenAI API
+### Running
+    $ streamlit run app.py
+
+## Reference
+* Langchain Docs: https://python.langchain.com/en/latest/index.html
+* Streamlist: https://streamlit.io/

apikey.py

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+apikey = 'sk-MySuperS3cr3tApiKey'

app.py

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+import os
+from apikey import apikey
+
+import streamlit as st
+from langchain.llms import OpenAI
+from langchain.prompts import PromptTemplate
+from langchain.chains import LLMChain, SequentialChain
+from langchain.memory import ConversationBufferMemory
+from langchain.utilities import WikipediaAPIWrapper
+
+os.environ['OPENAI_API_KEY'] = apikey
+
+st.title('🦜🔗 LangChain Tutorial - YouTube GPT Creator - by Raseel ')
+prompt = st.text_input('Prompt: Write me a Youtube Video Script about')
+
+# Prompt Templates
+title_template = PromptTemplate(
+    input_variables = ['topic'],
+    template='Write me a Youtube Video title about {topic}'
+)
+
+script_template = PromptTemplate(
+    input_variables = ['title', 'wikipedia_research'],
+    template='Write me a Youtube Video script based on the title, TITLE {title} while leveraging its Wikipedia researc: {wikipedia_research}'
+)
+
+# Memory
+title_memory = ConversationBufferMemory(input_key='topic', memory_key='chat_history')
+script_memory = ConversationBufferMemory(input_key='title', memory_key='chat_history')
+
+# LLMs
+llm = OpenAI(temperature=0.9)
+title_chain = LLMChain(llm=llm, prompt=title_template, verbose=True, output_key='title', memory=title_memory)
+script_chain = LLMChain(llm=llm, prompt=script_template, verbose=True, output_key='script', memory=script_memory)
+
+# Tools
+wiki = WikipediaAPIWrapper()
+
+# sequential_chain = SequentialChain(chains=[title_chain, script_chain],
+#                                    input_variables=['topic'],
+#                                    output_variables=['title', 'script'],
+#                                    verbose=True)
+
+if prompt:
+	title = title_chain.run(prompt)
+	wiki_research = wiki.run(prompt)
+	script = script_chain.run(title=title, wikipedia_research=wiki_research)
+	
+	st.write(title)
+	st.write(script)
+
+	with st.expander('Title History:'):
+		st.info(title_memory.buffer)
+	
+	with st.expander('Script History:'):
+		st.info(script_memory.buffer)
+	
+	with st.expander('Wikipedia Research:'):
+		st.info(wiki_research)

requirements.txt

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+aiohttp==3.8.4
+aiosignal==1.3.1
+altair==5.0.1
+anyio==3.7.0
+async-timeout==4.0.2
+attrs==23.1.0
+backoff==2.2.1
+beautifulsoup4==4.12.2
+blinker==1.6.2
+cachetools==5.3.1
+certifi==2023.5.7
+charset-normalizer==3.1.0
+chromadb==0.3.26
+click==8.1.3
+clickhouse-connect==0.6.1
+coloredlogs==15.0.1
+dataclasses-json==0.5.7
+decorator==5.1.1
+duckdb==0.8.0
+exceptiongroup==1.1.1
+fastapi==0.96.0
+flatbuffers==23.5.26
+frozenlist==1.3.3
+gitdb==4.0.10
+GitPython==3.1.31
+greenlet==2.0.2
+h11==0.14.0
+hnswlib==0.7.0
+httptools==0.5.0
+humanfriendly==10.0
+idna==3.4
+importlib-metadata==6.6.0
+Jinja2==3.1.2
+jsonschema==4.17.3
+langchain==0.0.193
+langchainplus-sdk==0.0.4
+lz4==4.3.2
+markdown-it-py==2.2.0
+MarkupSafe==2.1.3
+marshmallow==3.19.0
+marshmallow-enum==1.5.1
+mdurl==0.1.2
+monotonic==1.6
+mpmath==1.3.0
+multidict==6.0.4
+mypy-extensions==1.0.0
+numexpr==2.8.4
+numpy==1.24.3
+onnxruntime==1.15.0
+openai==0.27.8
+openapi-schema-pydantic==1.2.4
+overrides==7.3.1
+packaging==23.1
+pandas==2.0.2
+Pillow==9.5.0
+posthog==3.0.1
+protobuf==4.23.2
+pulsar-client==3.2.0
+pyarrow==12.0.0
+pydantic==1.10.8
+pydeck==0.8.1b0
+Pygments==2.15.1
+Pympler==1.0.1
+pyrsistent==0.19.3
+python-dateutil==2.8.2
+python-dotenv==1.0.0
+pytz==2023.3
+pytz-deprecation-shim==0.1.0.post0
+PyYAML==6.0
+regex==2023.6.3
+requests==2.31.0
+rich==13.4.1
+six==1.16.0
+smmap==5.0.0
+sniffio==1.3.0
+soupsieve==2.4.1
+SQLAlchemy==2.0.15
+starlette==0.27.0
+streamlit==1.23.1
+sympy==1.12
+tenacity==8.2.2
+tiktoken==0.4.0
+tokenizers==0.13.3
+toml==0.10.2
+toolz==0.12.0
+tornado==6.3.2
+tqdm==4.65.0
+typing-inspect==0.9.0
+typing_extensions==4.6.3
+tzdata==2023.3
+tzlocal==4.3
+urllib3==2.0.3
+uvicorn==0.22.0
+uvloop==0.17.0
+validators==0.20.0
+watchfiles==0.19.0
+websockets==11.0.3
+wikipedia==1.4.0
+yarl==1.9.2
+zipp==3.15.0
+zstandard==0.21.0