fix typos

yolox/utils/metric.py

@@ -14,7 +14,7 @@ __all__ = [
     "AverageMeter",
     "MeterBuffer",
     "get_total_and_free_memory_in_Mb",
-    "occumpy_mem",
+    "occupy_mem",
     "gpu_mem_usage",
 ]
 
@@ -28,7 +28,7 @@ def get_total_and_free_memory_in_Mb(cuda_device):
     return int(total), int(used)
 
 
-def occumpy_mem(cuda_device, mem_ratio=0.9):
+def occupy_mem(cuda_device, mem_ratio=0.9):
     """
     pre-allocate gpu memory for training to avoid memory Fragmentation.
     """