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Fix typos
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aleju committed Mar 14, 2017
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3 changes: 3 additions & 0 deletions neural-nets/Fast_R-CNN.md
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* **Tags**: Neural Network, RCNN, VGG, AlexNet, selective search
* **Year**: 2015

# Summary

* What
* The original R-CNN had three major disadvantages:
1. Two-staged training pipeline: Instead of only training a CNN, one had to train first a CNN and then multiple SVMs.
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* mAP improves from 66.0% to 66.6% (66.9% without SVD).
* Per class accuracy results:
* Fast_R-CNN__pvoc2012.jpg
* ![VOC2012 results](images/Fast_R-CNN__pvoc2012.jpg?raw=true "VOC2012 results")
* Fixing the weights of VGG16's convolutional layers and only fine-tuning the fully connected layers (those are applied to each region proposal), decreases the accuracy to 61.4%.
* This decrease in accuracy is most significant for the later convolutional layers, but marginal for the first layers.
* Therefor they only train the convolutional layers starting with `conv3_1` (9 out of 13 layers), which speeds up training.
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2 changes: 2 additions & 0 deletions neural-nets/Faster_R-CNN.md
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* **Tags**: Neural Network, RCNN
* **Year**: 2015

# Summary

* What
* R-CNN and its successor Fast R-CNN both rely on a "classical" method to find region proposals in images (i.e. "Which regions of the image look like they *might* be objects?").
* That classical method is selective search.
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* ![Batch Normalization Equations](images/Instance_Normalization_The_Missing_Ingredient_for_Fast_Stylization__batch_normalization.jpg?raw=true "Batch Normalization Equations")
* Instance Normalization
* ![Instance Normalization Equations](images/Instance_Normalization_The_Missing_Ingredient_for_Fast_Stylization__instance_normalization.jpg?raw=true "Instance Normalization Equations")
* They apply instance normalization and test time too (identically).
* They apply instance normalization at test time too (identically).

* Results
* Same image quality as iterative approach (at a fraction of the runtime).
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