Open AI env var fix (#2384)

mem0/llms/openai.py

@@ -1,5 +1,5 @@
-import json
 import os
+import warnings
 from typing import Dict, List, Optional
 
 from openai import OpenAI
@@ -24,7 +24,19 @@ class OpenAILLM(LLMBase):
             )
         else:
             api_key = self.config.api_key or os.getenv("OPENAI_API_KEY")
-            base_url = self.config.openai_base_url or os.getenv("OPENAI_API_BASE") or "https://api.openai.com/v1"
+            base_url = (
+                self.config.openai_base_url
+                or os.getenv("OPENAI_API_BASE")
+                or os.getenv("OPENAI_BASE_URL")
+                or "https://api.openai.com/v1"
+            )
+            if os.environ.get("OPENAI_API_BASE"):
+                warnings.warn(
+                    "The environment variable 'OPENAI_API_BASE' is deprecated and will be removed in the 0.1.80. "
+                    "Please use 'OPENAI_BASE_URL' instead.",
+                    DeprecationWarning
+                )
+
             self.client = OpenAI(api_key=api_key, base_url=base_url)
 
     def _parse_response(self, response, tools):