fix: support experimental support for Deepseek models and update docs about configuration (#1024)

* fix qlib running bug for deepseek and add configuration docs about deepseek

docs/installation_and_configuration.rst

@@ -16,6 +16,9 @@ Ensure the current user can run Docker commands **without using sudo**. You can
 LiteLLM Backend Configuration (Default)
 =======================================
 
+.. note::
+   🔥 **Attention**: We now provide experimental support for **DeepSeek** models! You can use DeepSeek's official API for cost-effective and high-performance inference. See the configuration example below for DeepSeek setup.
+
 Option 1: Unified API base for both models
 ------------------------------------------
 
@@ -48,6 +51,23 @@ Option 2: Separate API bases for Chat and Embedding models
       LITELLM_PROXY_API_KEY=<replace_with_your_siliconflow_api_key>
       LITELLM_PROXY_API_BASE=https://api.siliconflow.cn/v1
 
+Configuration Example: DeepSeek Setup
+-------------------------------------
+
+Many users encounter configuration errors when setting up DeepSeek. Here's a complete working example:
+
+   .. code-block:: Properties
+
+      # CHAT MODEL: Using DeepSeek Official API
+      CHAT_MODEL=deepseek/deepseek-chat 
+      DEEPSEEK_API_KEY=<replace_with_your_deepseek_api_key>
+
+      # EMBEDDING MODEL: Using SiliconFlow for embedding since DeepSeek has no embedding model.
+      # Note: embedding requires litellm_proxy prefix
+      EMBEDDING_MODEL=litellm_proxy/BAAI/bge-m3
+      LITELLM_PROXY_API_KEY=<replace_with_your_siliconflow_api_key>
+      LITELLM_PROXY_API_BASE=https://api.siliconflow.cn/v1
+
 Necessary parameters include:
 
 - `CHAT_MODEL`: The model name of the chat model.