In more complex models, such as those from the Fast R-CNN family for detection or recurrent networks used in natural language processing, the bits with control flow like for loops need to be scripted....

RCNN

Extracted text: In more complex models, such as those from the Fast R-CNN family for detection or recurrent networks used in natural language processing, the bits with control flow like for loops need to be scripted. Similarly, if we needed the flexibility, we would find the code bit the tracer warned about.