remove redundant imports

exo/inference/dummy_inference_engine.py

@@ -1,16 +1,9 @@
 from typing import Optional, Tuple, TYPE_CHECKING
 import numpy as np
-import random
-import string
-import asyncio
 from exo.inference.inference_engine import InferenceEngine
 from exo.inference.shard import Shard
 from exo.inference.tokenizers import DummyTokenizer
 
-def random_string(length: int):
-  return ''.join([random.choice(string.ascii_lowercase) for i in range(length)])
-  
-
 class DummyInferenceEngine(InferenceEngine):
   def __init__(self):
     self.shard = None
@@ -26,7 +19,6 @@ class DummyInferenceEngine(InferenceEngine):
     return np.array(self.tokenizer.encode(prompt))
   
   async def sample(self, x: np.ndarray) -> np.ndarray:
-    print('sample', x)
     if x[0] > self.num_generate_dummy_tokens: return np.array([self.tokenizer.eos_token_id])
     return x