fix: remove 2 * 0.5 in noise generation

Author: fracape

compressai/entropy_models/entropy_models.py

@@ -158,7 +158,7 @@ def quantize(
 
         if mode == "noise":
             half = float(0.5)
-            noise = 2*half*torch.rand_like(inputs) - half
+            noise = torch.rand_like(inputs) - half
             inputs = inputs + noise
             return inputs