[GitHub] [incubator-tvm] yongwww opened a new pull request #4417: [TOPI][RELAY][OP] add op crop_and_resize

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yongwww opened a new pull request #4417: [TOPI][RELAY][OP] add op crop_and_resize
URL: https://github.com/apache/incubator-tvm/pull/4417
 
 
   Add `crop_and_resize` op into topi and relay and TensorFlow frontend. 
   
   Some of the reasons why we need `crop_and_resize` are as below:
   
   - `CropAndResize` is being used in TensorFlow frequently in both training and inference, 'almost' all models (such as ssd, maskrcnn, etc.) in tensorflow object detection zoo are using this op.
   - It is possible to use `strided_slice`, `resize` and `concatenate` to compose `crop_and_resize` for some cases,  but the composition is not able to cover all cases, for example, when  `extrapolation_value` is used, `boxes` and/or `box_indices` are not list, etc. 
   - Most importantly, using `strided_slice`, `resize` and `concatenate` to build `CropAndResize` will introduce a significant number of ops in the converted relay ir when there are a lot of boxes as input, it does happen in models like ssd in tensorflow object detection model zoo.
   
   @kevinthesun @zhiics @icemelon9 @jwfromm 
   

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