OAI: Copy gen params for "n"

For multiple generations in the same request, nested arrays kept their
original reference, resulting in duplications. This will occur with
any collection type.

For optimization purposes, a deepcopy isn't run for the first iteration
since original references are created.

This is not the most elegant solution, but it works for the described
cases.

Signed-off-by: kingbri <bdashore3@proton.me>

endpoints/OAI/utils/completion.py

@@ -3,6 +3,7 @@
 import asyncio
 import pathlib
 from asyncio import CancelledError
+from copy import deepcopy
 from fastapi import HTTPException, Request
 from typing import List, Optional
 
@@ -111,12 +112,21 @@ async def generate_completion(data: CompletionRequest, model_path: pathlib.Path)
     """Non-streaming generate for completions"""
 
     gen_tasks: List[asyncio.Task] = []
+    gen_params = data.to_gen_params()
 
     try:
-        for _ in range(0, data.n):
+        for n in range(0, data.n):
+
+            # Deepcopy gen params above the first index
+            # to ensure nested structures aren't shared
+            if n > 0:
+                task_gen_params = deepcopy(gen_params)
+            else:
+                task_gen_params = gen_params
+
             gen_tasks.append(
                 asyncio.create_task(
-                    model.container.generate(data.prompt, **data.to_gen_params())
+                    model.container.generate(data.prompt, **task_gen_params)
                 )
             )