langchain: add deepseek provider to init chat model

.github/workflows/_release.yml

@@ -217,7 +217,8 @@ jobs:
 
           # Replace all dashes in the package name with underscores,
           # since that's how Python imports packages with dashes in the name.
-          IMPORT_NAME="$(echo "$PKG_NAME" | sed s/-/_/g)"
+          # also remove _official suffix
+          IMPORT_NAME="$(echo "$PKG_NAME" | sed s/-/_/g | sed s/_official//g)"
 
           poetry run python -c "import $IMPORT_NAME; print(dir($IMPORT_NAME))"
 

libs/langchain/langchain/chat_models/base.py

@@ -416,6 +416,11 @@ def _init_chat_model_helper(
         from langchain_google_vertexai.model_garden import ChatAnthropicVertex
 
         return ChatAnthropicVertex(model=model, **kwargs)
+    elif model_provider == "deepseek":
+        _check_pkg("langchain_deepseek", pkg_kebab="langchain-deepseek-official")
+        from langchain_deepseek import ChatDeepSeek
+
+        return ChatDeepSeek(model=model, **kwargs)
     else:
         supported = ", ".join(_SUPPORTED_PROVIDERS)
         raise ValueError(
@@ -440,6 +445,7 @@ def _init_chat_model_helper(
     "bedrock",
     "bedrock_converse",
     "google_anthropic_vertex",
+    "deepseek",
 }
 
 
@@ -480,12 +486,11 @@ def _parse_model(model: str, model_provider: Optional[str]) -> Tuple[str, str]:
     return model, model_provider
 
 
-def _check_pkg(pkg: str) -> None:
+def _check_pkg(pkg: str, *, pkg_kebab: Optional[str] = None) -> None:
     if not util.find_spec(pkg):
-        pkg_kebab = pkg.replace("_", "-")
+        pkg_kebab = pkg_kebab if pkg_kebab is not None else pkg.replace("_", "-")
         raise ImportError(
-            f"Unable to import {pkg_kebab}. Please install with "
-            f"`pip install -U {pkg_kebab}`"
+            f"Unable to import {pkg}. Please install with `pip install -U {pkg_kebab}`"
         )
 
 

libs/partners/deepseek/pyproject.toml

@@ -61,6 +61,7 @@ pytest-socket = "^0.7.0"
 pytest-watcher = "^0.3.4"
 langchain-tests = "^0.3.5"
 langchain-openai = { path = "../openai" }
+pytest-timeout = "^2.3.1"
 
 [tool.poetry.group.codespell.dependencies]
 codespell = "^2.2.6"

libs/partners/deepseek/tests/integration_tests/test_chat_models.py

@@ -2,6 +2,7 @@
 
 from typing import Type
 
+import pytest
 from langchain_tests.integration_tests import ChatModelIntegrationTests
 
 from langchain_deepseek.chat_models import ChatDeepSeek
@@ -21,6 +22,7 @@ def chat_model_params(self) -> dict:
         }
 
 
+@pytest.mark.xfail(reason="Reasoning API is down")
 def test_reasoning_content() -> None:
     """Test reasoning content."""
     chat_model = ChatDeepSeek(model="deepseek-reasoner")