community[minor]: add hf chat wrapper (#14736)

Builds on #14040 with community refactor merged and notebook updated.

Note that with this refactor, models will be imported from
`langchain_community.chat_models.huggingface` rather than the main
`langchain` repo.

---------

Signed-off-by: harupy <17039389+harupy@users.noreply.github.com>
Signed-off-by: ugm2 <unaigaraymaestre@gmail.com>
Signed-off-by: Yuchen Liang <yuchenl3@andrew.cmu.edu>
Co-authored-by: Andrew Reed <andrew.reed.r@gmail.com>
Co-authored-by: Andrew Reed <areed1242@gmail.com>
Co-authored-by: A-Roucher <aymeric.roucher@gmail.com>
Co-authored-by: Aymeric Roucher <69208727+A-Roucher@users.noreply.github.com>

libs/community/tests/unit_tests/chat_models/test_huggingface.py

@@ -0,0 +1,11 @@
+"""Test HuggingFace Chat wrapper."""
+from importlib import import_module
+
+
+def test_import_class() -> None:
+    """Test that the class can be imported."""
+    module_name = "langchain_community.chat_models.huggingface"
+    class_name = "ChatHuggingFace"
+
+    module = import_module(module_name)
+    assert hasattr(module, class_name)

libs/community/tests/unit_tests/chat_models/test_imports.py

@@ -11,6 +11,7 @@ EXPECTED_ALL = [
     "ChatCohere",
     "ChatDatabricks",
     "ChatGooglePalm",
+    "ChatHuggingFace",
     "ChatMlflow",
     "ChatMLflowAIGateway",
     "ChatOllama",