community: Ollama - Parameter structure to follow official documentation (#16035)

## Feature
- Follow parameter structure as per official documentation 
- top level parameters (e.g. model, system, template) will be passed as
top level parameters
  - other parameters will be sent in options unless options is provided

![image](https://github.com/langchain-ai/langchain/assets/17451563/d14715d9-9701-4ee3-b44b-89fffea62389)

## Tests
- Test if top level parameters handled properly
- Test if parameters that are not top level parameters are handled as
options
- Test if options is provided, it will be passed as is

libs/community/langchain_community/llms/ollama.py

@@ -190,8 +190,9 @@ class _OllamaCommon(BaseLanguageModel):
 
         params = self._default_params
 
-        if "model" in kwargs:
+        for key in self._default_params:
-            params["model"] = kwargs["model"]
+            if key in kwargs:
+                params[key] = kwargs[key]
 
         if "options" in kwargs:
             params["options"] = kwargs["options"]
@@ -199,7 +200,7 @@ class _OllamaCommon(BaseLanguageModel):
             params["options"] = {
                 **params["options"],
                 "stop": stop,
-                **kwargs,
+                **{k: v for k, v in kwargs.items() if k not in self._default_params},
             }
 
         if payload.get("messages"):
@@ -253,8 +254,9 @@ class _OllamaCommon(BaseLanguageModel):
 
         params = self._default_params
 
-        if "model" in kwargs:
+        for key in self._default_params:
-            params["model"] = kwargs["model"]
+            if key in kwargs:
+                params[key] = kwargs[key]
 
         if "options" in kwargs:
             params["options"] = kwargs["options"]
@@ -262,7 +264,7 @@ class _OllamaCommon(BaseLanguageModel):
             params["options"] = {
                 **params["options"],
                 "stop": stop,
-                **kwargs,
+                **{k: v for k, v in kwargs.items() if k not in self._default_params},
             }
 
         if payload.get("messages"):

libs/community/tests/unit_tests/llms/test_ollama.py

@@ -31,7 +31,7 @@ def test_pass_headers_if_provided(monkeypatch: MonkeyPatch) -> None:
         timeout=300,
     )
 
-    def mockPost(url, headers, json, stream, timeout):
+    def mock_post(url, headers, json, stream, timeout):
         assert url == "https://ollama-hostname:8000/api/generate/"
         assert headers == {
             "Content-Type": "application/json",
@@ -44,7 +44,7 @@ def test_pass_headers_if_provided(monkeypatch: MonkeyPatch) -> None:
 
         return mock_response_stream()
 
-    monkeypatch.setattr(requests, "post", mockPost)
+    monkeypatch.setattr(requests, "post", mock_post)
 
     llm("Test prompt")
 
@@ -52,7 +52,7 @@ def test_pass_headers_if_provided(monkeypatch: MonkeyPatch) -> None:
 def test_handle_if_headers_not_provided(monkeypatch: MonkeyPatch) -> None:
     llm = Ollama(base_url="https://ollama-hostname:8000", model="foo", timeout=300)
 
-    def mockPost(url, headers, json, stream, timeout):
+    def mock_post(url, headers, json, stream, timeout):
         assert url == "https://ollama-hostname:8000/api/generate/"
         assert headers == {
             "Content-Type": "application/json",
@@ -63,6 +63,131 @@ def test_handle_if_headers_not_provided(monkeypatch: MonkeyPatch) -> None:
 
         return mock_response_stream()
 
-    monkeypatch.setattr(requests, "post", mockPost)
+    monkeypatch.setattr(requests, "post", mock_post)
 
     llm("Test prompt")
+
+
+def test_handle_kwargs_top_level_parameters(monkeypatch: MonkeyPatch) -> None:
+    """Test that top level params are sent to the endpoint as top level params"""
+    llm = Ollama(base_url="https://ollama-hostname:8000", model="foo", timeout=300)
+
+    def mock_post(url, headers, json, stream, timeout):
+        assert url == "https://ollama-hostname:8000/api/generate/"
+        assert headers == {
+            "Content-Type": "application/json",
+        }
+        assert json == {
+            "format": None,
+            "images": None,
+            "model": "test-model",
+            "options": {
+                "mirostat": None,
+                "mirostat_eta": None,
+                "mirostat_tau": None,
+                "num_ctx": None,
+                "num_gpu": None,
+                "num_thread": None,
+                "repeat_last_n": None,
+                "repeat_penalty": None,
+                "stop": [],
+                "temperature": None,
+                "tfs_z": None,
+                "top_k": None,
+                "top_p": None,
+            },
+            "prompt": "Test prompt",
+            "system": "Test system prompt",
+            "template": None,
+        }
+        assert stream is True
+        assert timeout == 300
+
+        return mock_response_stream()
+
+    monkeypatch.setattr(requests, "post", mock_post)
+
+    llm("Test prompt", model="test-model", system="Test system prompt")
+
+
+def test_handle_kwargs_with_unknown_param(monkeypatch: MonkeyPatch) -> None:
+    """
+    Test that params that are not top level params will be sent to the endpoint
+    as options
+    """
+    llm = Ollama(base_url="https://ollama-hostname:8000", model="foo", timeout=300)
+
+    def mock_post(url, headers, json, stream, timeout):
+        assert url == "https://ollama-hostname:8000/api/generate/"
+        assert headers == {
+            "Content-Type": "application/json",
+        }
+        assert json == {
+            "format": None,
+            "images": None,
+            "model": "foo",
+            "options": {
+                "mirostat": None,
+                "mirostat_eta": None,
+                "mirostat_tau": None,
+                "num_ctx": None,
+                "num_gpu": None,
+                "num_thread": None,
+                "repeat_last_n": None,
+                "repeat_penalty": None,
+                "stop": [],
+                "temperature": 0.8,
+                "tfs_z": None,
+                "top_k": None,
+                "top_p": None,
+                "unknown": "Unknown parameter value",
+            },
+            "prompt": "Test prompt",
+            "system": None,
+            "template": None,
+        }
+        assert stream is True
+        assert timeout == 300
+
+        return mock_response_stream()
+
+    monkeypatch.setattr(requests, "post", mock_post)
+
+    llm("Test prompt", unknown="Unknown parameter value", temperature=0.8)
+
+
+def test_handle_kwargs_with_options(monkeypatch: MonkeyPatch) -> None:
+    """
+    Test that if options provided it will be sent to the endpoint as options,
+    ignoring other params that are not top level params.
+    """
+    llm = Ollama(base_url="https://ollama-hostname:8000", model="foo", timeout=300)
+
+    def mock_post(url, headers, json, stream, timeout):
+        assert url == "https://ollama-hostname:8000/api/generate/"
+        assert headers == {
+            "Content-Type": "application/json",
+        }
+        assert json == {
+            "format": None,
+            "images": None,
+            "model": "test-another-model",
+            "options": {"unknown_option": "Unknown option value"},
+            "prompt": "Test prompt",
+            "system": None,
+            "template": None,
+        }
+        assert stream is True
+        assert timeout == 300
+
+        return mock_response_stream()
+
+    monkeypatch.setattr(requests, "post", mock_post)
+
+    llm(
+        "Test prompt",
+        model="test-another-model",
+        options={"unknown_option": "Unknown option value"},
+        unknown="Unknown parameter value",
+        temperature=0.8,
+    )