Before revision:  However, in the literature, in addition to improvements to the model architecture , there are a number of improvements either briefly mentioned as implementation details or visible only in source code, and these overlooked techniques may play a pivotal role in their practical use .
After revision:  However, in addition to their reliance on elaborate architectures and algorithms , there are a number of improvements either briefly mentioned as implementation details or visible only in source code, and these overlooked techniques may play a pivotal role in their practical use .