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langchain-ollama (partners) / langchain-core: allow passing ChatMessages to Ollama (including arbitrary roles) (#30411)

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Replacement for PR #30191 (@ccurme)

**Description**: currently, ChatOllama [will raise a value error if a
ChatMessage is passed to
it](https://github.com/langchain-ai/langchain/blob/master/libs/partners/ollama/langchain_ollama/chat_models.py#L514),
as described
https://github.com/langchain-ai/langchain/pull/30147#issuecomment-2708932481.

Furthermore, ollama-python is removing the limitations on valid roles
that can be passed through chat messages to a model in ollama -
https://github.com/ollama/ollama-python/pull/462#event-16917810634.

This PR removes the role limitations imposed by langchain and enables
passing langchain ChatMessages with arbitrary 'role' values through the
langchain ChatOllama class to the underlying ollama-python Client.

As this PR relies on [merged but unreleased functionality in
ollama-python](
https://github.com/ollama/ollama-python/pull/462#event-16917810634), I
have temporarily pointed the ollama package source to the main branch of
the ollama-python github repo.

Format, lint, and tests of new functionality passing. Need to resolve
issue with recently added ChatOllama tests. (Now resolved)

**Issue**: resolves #30122 (related to ollama issue
https://github.com/ollama/ollama/issues/8955)

**Dependencies**: no new dependencies

[x] PR title
[x] PR message
[x] Lint and test: format, lint, and test all running successfully and
passing

---------

Co-authored-by: Ryan Stewart <ryanstewart@Ryans-MacBook-Pro.local>
Co-authored-by: Chester Curme <chester.curme@gmail.com>
This commit is contained in:
rylativity
2025-04-18 10:07:07 -04:00
committed by GitHub
parent 0c723af4b0
commit dbf9986d44
5 changed files with 588 additions and 478 deletions
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5
libs/partners/ollama/pyproject.toml
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@@ -6,7 +6,10 @@ build-backend = "pdm.backend"
authors = []
license = { text = "MIT" }
requires-python = "<4.0,>=3.9"
dependencies = ["ollama<1,>=0.4.4", "langchain-core<1.0.0,>=0.3.52"]
dependencies = [
"ollama>=0.4.8,<1.0.0",
"langchain-core<1.0.0,>=0.3.52",
]
name = "langchain-ollama"
version = "0.3.2"
description = "An integration package connecting Ollama and LangChain"