community[patch]: update OctoAI endpoint to subclass BaseOpenAI (#19757)

This PR updates OctoAIEndpoint LLM to subclass BaseOpenAI as OctoAI is
an OpenAI-compatible service. The documentation and tests have also been
updated.

libs/community/tests/integration_tests/llms/test_octoai_endpoint.py

@@ -1,58 +1,11 @@
 """Test OctoAI API wrapper."""
 
-from pathlib import Path
-
-import pytest
-
-from langchain_community.llms.loading import load_llm
 from langchain_community.llms.octoai_endpoint import OctoAIEndpoint
-from tests.integration_tests.llms.utils import assert_llm_equality
 
 
-def test_octoai_endpoint_text_generation() -> None:
-    """Test valid call to OctoAI text generation model."""
-    llm = OctoAIEndpoint(
-        endpoint_url="https://mpt-7b-demo-f1kzsig6xes9.octoai.run/generate",
-        octoai_api_token="<octoai_api_token>",
-        model_kwargs={
-            "max_new_tokens": 200,
-            "temperature": 0.75,
-            "top_p": 0.95,
-            "repetition_penalty": 1,
-            "seed": None,
-            "stop": [],
-        },
-    )
-
+def test_octoai_endpoint_call() -> None:
+    """Test valid call to OctoAI endpoint."""
+    llm = OctoAIEndpoint()
     output = llm("Which state is Los Angeles in?")
     print(output)  # noqa: T201
     assert isinstance(output, str)
-
-
-def test_octoai_endpoint_call_error() -> None:
-    """Test valid call to OctoAI that errors."""
-    llm = OctoAIEndpoint(
-        endpoint_url="https://mpt-7b-demo-f1kzsig6xes9.octoai.run/generate",
-        model_kwargs={"max_new_tokens": -1},
-    )
-    with pytest.raises(ValueError):
-        llm("Which state is Los Angeles in?")
-
-
-def test_saving_loading_endpoint_llm(tmp_path: Path) -> None:
-    """Test saving/loading an OctoAIHub LLM."""
-    llm = OctoAIEndpoint(
-        endpoint_url="https://mpt-7b-demo-f1kzsig6xes9.octoai.run/generate",
-        octoai_api_token="<octoai_api_token>",
-        model_kwargs={
-            "max_new_tokens": 200,
-            "temperature": 0.75,
-            "top_p": 0.95,
-            "repetition_penalty": 1,
-            "seed": None,
-            "stop": [],
-        },
-    )
-    llm.save(file_path=tmp_path / "octoai.yaml")
-    loaded_llm = load_llm(tmp_path / "octoai.yaml")
-    assert_llm_equality(llm, loaded_llm)