[Documentation] Using non-OpenAI models (#2076)

* Addition of Non-OpenAI LLM section and main doc page

* Continued writing...

* Continued writing - cloud-based proxy servers

* Folder renamed

* Further writing

* together.ai example added

* Local proxy server added, diagram added, tidy up

* Added vLLM to local proxy servers documentation

* As per @ekzhu's feedback, individual pages and tidy up

* Added reference to LM Studio and renamed file

* Fixed incorrect huggingface.co link

* Run pre-commit checks, added LM Studio redirect

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Co-authored-by: Eric Zhu <ekzhu@users.noreply.github.com>

website/docs/topics/non-openai-models/about-using-nonopenai-models.md

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+# Non-OpenAI Models
+
+AutoGen allows you to use non-OpenAI models through proxy servers that provide
+an OpenAI-compatible API or a [custom model client](https://microsoft.github.io/autogen/blog/2024/01/26/Custom-Models)
+class.
+
+Benefits of this flexibility include access to hundreds of models, assigning specialized
+models to agents (e.g., fine-tuned coding models), the ability to run AutoGen entirely
+within your environment, utilising both OpenAI and non-OpenAI models in one system, and cost
+reductions in inference.
+
+## OpenAI-compatible API proxy server
+Any proxy server that provides an API that is compatible with [OpenAI's API](https://platform.openai.com/docs/api-reference)
+will work with AutoGen.
+
+These proxy servers can be cloud-based or running locally within your environment.
+
+![Cloud or Local Proxy Servers](images/cloudlocalproxy.png)
+
+### Cloud-based proxy servers
+By using cloud-based proxy servers, you are able to use models without requiring the hardware
+and software to run them.
+
+These providers can host open source/weight models, like [Hugging Face](https://huggingface.co/),
+or their own closed models.
+
+When cloud-based proxy servers provide an OpenAI-compatible API, using them in AutoGen
+is straightforward. With [LLM Configuration](/docs/topics/llm_configuration) done in
+the same way as when using OpenAI's models, the primary difference is typically the
+authentication which is usually handled through an API key.
+
+Examples of using cloud-based proxy servers providers that have an OpenAI-compatible API
+are provided below:
+
+- [together.ai example](cloud-togetherai)
+
+
+### Locally run proxy servers
+An increasing number of LLM proxy servers are available for use locally. These can be
+open-source (e.g., LiteLLM, Ollama, vLLM) or closed-source (e.g., LM Studio), and are
+typically used for running the full-stack within your environment.
+
+Similar to cloud-based proxy servers, as long as these proxy servers provide an
+OpenAI-compatible API, running them in AutoGen is straightforward.
+
+Examples of using locally run proxy servers that have an OpenAI-compatible API are
+provided below:
+
+- [LiteLLM with Ollama example](local-litellm-ollama)
+- [LM Studio](local-lm-studio)
+- [vLLM example](local-vllm)
+
+````mdx-code-block
+:::tip
+If you are planning to use Function Calling, not all cloud-based and local proxy servers support
+Function Calling with their OpenAI-compatible API, so check their documentation.
+:::
+````
+
+### Configuration for Non-OpenAI models
+
+Whether you choose a cloud-based or locally-run proxy server, the configuration is done in
+the same way as using OpenAI's models, see [LLM Configuration](/docs/topics/llm_configuration)
+for further information.
+
+You can use [model configuration filtering](/docs/topics/llm_configuration#config-list-filtering)
+to assign specific models to agents.
+
+
+## Custom Model Client class
+For more advanced users, you can create your own custom model client class, enabling
+you to define and load your own models.
+
+See the [AutoGen with Custom Models: Empowering Users to Use Their Own Inference Mechanism](/blog/2024/01/26/Custom-Models)
+blog post and [this notebook](/docs/notebooks/agentchat_custom_model/) for a guide to creating custom model client classes.

website/docs/topics/non-openai-models/cloud-togetherai.md

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+# Together AI
+This cloud-based proxy server example, using [together.ai](https://www.together.ai/), is a group chat between a Python developer
+and a code reviewer, who are given a coding task.
+
+Start by [installing AutoGen](/docs/installation/) and getting your [together.ai API key](https://api.together.xyz/settings/profile).
+
+Put your together.ai API key in an environment variable, TOGETHER_API_KEY.
+
+Linux / Mac OSX:
+
+```bash
+export TOGETHER_API_KEY=YourTogetherAIKeyHere
+```
+
+Windows (command prompt):
+
+```powershell
+set TOGETHER_API_KEY=YourTogetherAIKeyHere
+```
+
+Create your LLM configuration, with the [model you want](https://docs.together.ai/docs/inference-models).
+
+```python
+import autogen
+import os
+
+llm_config={
+    "config_list": [
+        {
+            # Available together.ai model strings:
+            # https://docs.together.ai/docs/inference-models
+            "model": "mistralai/Mistral-7B-Instruct-v0.1",
+            "api_key": os.environ['TOGETHER_API_KEY'],
+            "base_url": "https://api.together.xyz/v1"
+        }
+    ],
+    "cache_seed": 42
+}
+```
+
+## Construct Agents
+
+```python
+# User Proxy will execute code and finish the chat upon typing 'exit'
+user_proxy = autogen.UserProxyAgent(
+    name="UserProxy",
+    system_message="A human admin",
+    code_execution_config={
+        "last_n_messages": 2,
+        "work_dir": "groupchat",
+        "use_docker": False,
+    },  # Please set use_docker=True if docker is available to run the generated code. Using docker is safer than running the generated code directly.
+    human_input_mode="TERMINATE",
+    is_termination_msg=lambda x: "TERMINATE" in x.get("content"),
+)
+
+# Python Coder agent
+coder = autogen.AssistantAgent(
+    name="softwareCoder",
+    description="Software Coder, writes Python code as required and reiterates with feedback from the Code Reviewer.",
+    system_message="You are a senior Python developer, a specialist in writing succinct Python functions.",
+    llm_config=llm_config,
+)
+
+# Code Reviewer agent
+reviewer = autogen.AssistantAgent(
+    name="codeReviewer",
+    description="Code Reviewer, reviews written code for correctness, efficiency, and security. Asks the Software Coder to address issues.",
+    system_message="You are a Code Reviewer, experienced in checking code for correctness, efficiency, and security. Review and provide feedback to the Software Coder until you are satisfied, then return the word TERMINATE",
+    is_termination_msg=lambda x: "TERMINATE" in x.get("content"),
+    llm_config=llm_config,
+)
+```
+
+## Establish the group chat
+
+```python
+# Establish the Group Chat and disallow a speaker being selected consecutively
+groupchat = autogen.GroupChat(agents=[user_proxy, coder, reviewer], messages=[], max_round=12, allow_repeat_speaker=False)
+
+# Manages the group of multiple agents
+manager = autogen.GroupChatManager(groupchat=groupchat, llm_config=llm_config)
+```
+
+## Start Chat
+
+```python
+# Start the chat with a request to write a function
+user_proxy.initiate_chat(
+    manager,
+    message="Write a Python function for the Fibonacci sequence, the function will have one parameter for the number in the sequence, which the function will return the Fibonacci number for."
+)
+# type exit to terminate the chat
+```
+
+Output:
+```` text
+UserProxy (to chat_manager):
+
+Write a Python function for the Fibonacci sequence, the function will have one parameter for the number in the sequence, which the function will return the Fibonacci number for.
+
+--------------------------------------------------------------------------------
+softwareCoder (to chat_manager):
+
+ Sure, here is a simple Python function that uses recursion to calculate the Fibonacci number:
+
+```python
+def fibonacci(n):
+    if n <= 0:
+        return "Input should be a positive integer."
+    elif n == 1:
+        return 0
+    elif n == 2:
+        return 1
+    else:
+        return fibonacci(n-1) + fibonacci(n-2)
+```
+
+This function takes an integer `n` as input and returns the `n`th number in the Fibonacci sequence. The Fibonacci sequence is a series of numbers in which each number is the sum of the two preceding ones, usually starting with 0 and 1.
+
+Note that this implementation uses recursion and may not be efficient for large values of `n`. In such cases, an iterative approach or memoization would be more appropriate.
+
+--------------------------------------------------------------------------------
+codeReviewer (to chat_manager):
+
+ I see a couple of issues with the current implementation of the `fibonacci` function:
+
+1. The function does not handle negative inputs correctly. Currently, it returns a string message for any input less than or equal to 0. It would be better to raise a `ValueError` or return a more informative message.
+2. The function uses recursion to calculate the Fibonacci number, which can be inefficient for large inputs. A more efficient approach would be to use an iterative approach or memoization.
+
+Here's an updated implementation that addresses these issues:
+
+```python
+def fibonacci(n):
+    if n <= 0:
+        raise ValueError("Input should be a positive integer.")
+    elif n == 1:
+        return 0
+    elif n == 2:
+        return 1
+    else:
+        a, b = 0, 1
+        for _ in range(n - 2):
+            a, b = b, a + b
+        return b
+```
+
+This implementation uses a loop to calculate the Fibonacci number iteratively, which is more efficient than the recursive approach. It also raises a `ValueError` for negative inputs, which is a more appropriate way to handle invalid inputs.
+
+--------------------------------------------------------------------------------
+
+>>>>>>>> USING AUTO REPLY...
+
+>>>>>>>> EXECUTING CODE BLOCK 0 (inferred language is python)...
+UserProxy (to chat_manager):
+
+exitcode: 0 (execution succeeded)
+Code output:
+
+
+--------------------------------------------------------------------------------
+codeReviewer (to chat_manager):
+
+ I'm glad the updated implementation addresses the issues with the original code. Let me know if you have any further questions or if there's anything else I can help you with.
+
+To terminate the conversation, please type "TERMINATE".
+
+--------------------------------------------------------------------------------
+Please give feedback to chat_manager. Press enter or type 'exit' to stop the conversation: exit
+````