docs: ollama doc update (toolcalling, install, notebook examples)

[BobMerkus]

The new langchain-ollama package seems pretty well implemented, but I noticed the docs were still outdated so I decided to fix em up a bit.

• Llama3.1 was release on 23rd of July; https://ai.meta.com/blog/meta-llama-3-1/
• Ollama supports tool calling since 25th of July; https://ollama.com/blog/tool-support
• LangChain Ollama partner package was released 1st of august; https://pypi.org/project/langchain-ollama/

Problem: Docs note langchain-community instead of langchain-ollama

Solution: Update docs to https://python.langchain.com/v0.2/docs/integrations/chat/ollama/

Problem: OllamaFunctions is deprecated, as noted on Integrations: This was an experimental wrapper that attempts to bolt-on tool calling support to models that do not natively support it. The primary Ollama integration now supports tool calling, and should be used instead.

Solution: Delete old notebook from repo, update the existing one with @tool decorator + pydantic examples to the notebook

Problem: Llama3.1 was released while llama3-groq-tool-call fine-tune Is noted in notebooks.

Solution: update docs + notebooks to llama3.1 (which has improved tool calling support)

Problem: Install instructions are incomplete, there is no information to download a model and/or run the Ollama server

Solution: Add simple instructions to start the ollama service and pull model (for toolcalling)

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Name	Status	Preview	Comments	Updated (UTC)
langchain	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 20, 2024 1:16pm

[ccurme]

Thank you!