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## R-CNN: *Regions with Convolutional Neural Network Features*

Created by Ross Girshick, Jeff Donahue, Trevor Darrell and Jitendra Malik at UC Berkeley EECS.

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Acknowledgements: a huge thanks to Yangqing Jia for creating Caffe and the BVLC team, with a special shoutout to Evan Shelhamer, for maintaining Caffe and helping to merge the R-CNN fine-tuning code into Caffe.

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### Introduction

R-CNN is a state-of-the-art visual object detection system that combines bottom-up region proposals with rich features computed by a convolutional neural network. At the time of its release, R-CNN improved the previous best detection performance on PASCAL VOC 2012 by 30% relative, going from 40.9% to 53.3% mean average precision. Unlike the previous best results, R-CNN achieves this performance without using contextual rescoring or an ensemble of feature types.

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R-CNN was initially described in an [arXiv tech report](http://arxiv.org/abs/1311.2524) and will appear in a forthcoming CVPR 2014 paper.

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### Citing R-CNN

If you find R-CNN useful in your research, please consider citing:

    @inproceedings{girshick14CVPR,
        Author = {Girshick, Ross and Donahue, Jeff and Darrell, Trevor and Malik, Jitendra},
        Title = {Rich feature hierarchies for accurate object detection and semantic segmentation},
        Booktitle = {Computer Vision and Pattern Recognition},
        Year = {2014}
    }

### License

R-CNN is released under the Simplified BSD License (refer to the
LICENSE file for details).

### Installing R-CNN

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0. **Prerequisites** 
  0. MATLAB (tested with 2012b on 64-bit Linux)
  0. Caffe's [prerequisites](http://caffe.berkeleyvision.org/installation.html#prequequisites)
0. **Install Caffe** (this is the most complicated part)
  0. Download this [tagged release of Caffe](http://todo)
  0. Follow the [Caffe installation instructions](http://caffe.berkeleyvision.org/installation.html)
  0. **Important:** Make sure to compile the Caffe MATLAB wrapper, which is not built by default: `$ make matcaffe`
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  0. Let's call the place where you installed caffe `$CAFFE_HOME`: `$ export CAFFE_HOME=$(pwd)`
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0. **Install R-CNN**
  0. Let's assume you've placed the R-CNN source in a folder called `rcnn`
  0. Change into that directory: `$ cd rcnn`
  0. R-CNN expects to find Caffe in `external/caffe`, so create a symlink: `$ ln -sf $CAFFE_HOME external/caffe`
  0. Start MATLAB (make sure you're in the `rcnn` folder): `$ matlab`
  0. You'll be prompted to download the [Selective Search](http://disi.unitn.it/~uijlings/MyHomepage/index.php#page=projects1) code, which we cannot redistribute. You should see the message `R-CNN startup done` followed by the MATLAB prompt.
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  0. Run the build script: `>> rcnn_build()` (builds [liblinear](http://www.csie.ntu.edu.tw/~cjlin/liblinear/) and [Selective Search](http://www.science.uva.nl/research/publications/2013/UijlingsIJCV2013/)). Don't worry if you see compiler warnings while building liblinear, this is normal on my system.
  0. Check that Caffe and MATLAB wrapper are set up correctly (this code should run without error): `>> key = caffe('get_init_key');` (expected output is key = -2)
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  0. Download the data package, which includes precompute models (see below).
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**Common issues:** You may need to set an `LD_LIBRARY_PATH` before you start MATLAB. If you see a message like "Invalid MEX-file '/path/to/rcnn/external/caffe/matlab/caffe/caffe.mexa64': libmkl_rt.so: cannot open shared object file: No such file or directory" then make sure that CUDA and MKL are in your `LD_LIBRARY_PATH`. On my system, I use:

    export LD_LIBRARY_PATH=/opt/intel/mkl/lib/intel64:/usr/local/cuda/lib64
  

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### Downloading precomputed models (the data package)

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The quickest way to get started is to download precomputed R-CNN detectors. Currently we have detectors trained on PASCAL VOC 2007 train+val and 2012 train. Unfortunately the download is large (1.5GB), so brew some coffee or take a walk while waiting.

From the `rcnn` folder, run the data fetch script: `$ ./data/fetch_data.sh`. 
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This will populate the `rcnn/data` folder with `caffe_nets`, `rcnn_models` and `selective_search_data`. See `rcnn/data/README.md` for details.
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### Running an R-CNN detector on an image

Let's assume that you've downloaded the precomputed detectors. Now:

1. Change to where you installed R-CNN: `$ cd rcnn`. 
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2. Start MATLAB `$ matlab`.
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  * **Important:** if you don't see the message `R-CNN startup done` when MATLAB starts, then you probably didn't start MATLAB in `rcnn` directory.
3. Run the demo: `>> rcnn_demo`

### Training your own R-CNN detector on PASCAL VOC

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Let's use PASCAL VOC 2007 as an example. The basic pipeline is: 

    extract features to disk -> train SVMs -> test
    
You'll need about 200GB of disk space free for the feature cache (which is stored in `rcnn/feat_cache` by default; symlink `rcnn/feat_cache` elsewhere if needed). **It's best if the feature cache is on a fast, local disk.** Before running the pipeline, we first need to install the PASCAL VOC 2007 dataset.
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#### Installing PASCAL VOC 2007

1. Download the training and validation data [here](http://pascallin.ecs.soton.ac.uk/challenges/VOC/voc2007/VOCtrainval_06-Nov-2007.tar).
2. Download the test data [here](http://pascallin.ecs.soton.ac.uk/challenges/VOC/voc2007/VOCtest_06-Nov-2007.tar).
3. Download the VOCdevkit [here](http://pascallin.ecs.soton.ac.uk/challenges/VOC/voc2007/VOCdevkit_08-Jun-2007.tar).
4. Extract all of these tars into one directory, let's call it `VOCdevkit`. It should have this basic structure:

<pre>
VOCdevkit/                           % development kit
VOCdevkit/VOCcode/                   % VOC utility code
VOCdevkit/VOC2007                    % image sets, annotations, etc.
... and several other directories ...
</pre>

I use a symlink to hook the R-CNN codebase to the PASCAL VOC dataset:

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`$ cd rcnn/datasets` and then `$ ln -sf /your/path/to/voc2007/VOCdevkit VOCdevkit2007`
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#### Extracting features

<pre>
>> rcnn_exp_cache_features('train');   % chunk1
>> rcnn_exp_cache_features('val');     % chunk2
>> rcnn_exp_cache_features('test_1');  % chunk3
>> rcnn_exp_cache_features('test_2');  % chunk4
</pre>

**Pro tip:** on a machine with one hefty GPU (e.g., k20, k40, titan) and a six-core processor, I run start two MATLAB sessions each with a three worker matlabpool. I then run chunk1 and chunk2 in parallel on that machine. In this setup, completing chunk1 and chunk2 takes about 8-9 hours (depending on your CPU/GPU combo and disk) on a single machine. Obviously, if you have more machines you can hack this function to split the workload.

#### Training R-CNN models and testing

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Now to run the training and testing code, use the following experiments script:

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<pre>
>> test_results = rcnn_exp_train_and_test()
</pre>

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**Note:** The training and testing procedures save models and results under `rcnn/cachedir` by default. You can customize this by creating a local config file named `rcnn_config_local.m` and defining the experiment directory variable `EXP_DIR`. Look at `rcnn_config_local.example.m` for an example.


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### Training an R-CNN detector on another dataset

It should be easy to train an R-CNN detector using another detection dataset as long as that dataset has *complete* bounding box annotations (i.e., all instances of all classes are labeled).

To support a new dataset, you define three functions: (1) one that returns a structure that describes the class labels and list of images; (2) one that returns a region of interest (roi) structure that describes the bounding box annotations; and (3) one that provides an test evaluation function.

You can follow the PASCAL VOC implementation as your guide:

* `imdb/imdb_from_voc.m   (list of images and classes)`  
* `imdb/roidb_from_voc.m (region of interest database)`
* `imdb/imdb_eval_voc.m   (evalutation)`  

### Fine-tuning a CNN for detection with Caffe

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As an example, let's see how you would fine-tune a CNN for detection on PASCAL VOC 2012.

0. Create window files for VOC 2012 train and VOC 2012 val.
  0. Start MATLAB in the `rcnn` directory
  0. Get the imdb for VOC 2012 train: `>> imdb_train = imdb_from_voc('datasets/VOCdevkit2012', 'train', '2012');`
  0. Get the imdb for VOC 2012 val: `>> imdb_val = imdb_from_voc('datasets/VOCdevkit2012', 'val', '2012');`
  0. Create the window file for VOC 2012 train: `>> rcnn_make_window_file(imdb_train, 'external/caffe/examples/pascal-finetuning');`
  0. Create the window file for VOC 2012 val: `>> rcnn_make_window_file(imdb_val, 'external/caffe/examples/pascal-finetuning');`
  0. Exit MATLAB
0. Run fine-tuning with Caffe
  0. Copy the fine-tuning prototxt files: `$ cp finetuning/voc_2012_prototxt/pascal_finetune_* external/caffe/examples/pascal-finetuning/`
  0. Change directories to `external/caffe/examples/pascal-finetuning`
  0. Execute the fine-tuning code (make sure to replace `/path/to/rcnn` with the actual path to where R-CNN is installed):
  
<pre>
GLOG_logtostderr=1 ../../build/tools/finetune_net.bin \
pascal_finetune_solver.prototxt \
/path/to/rcnn/data/caffe_nets/ilsvrc_2012_train_iter_310k 2>&1 | tee log.txt
</pre>
      
**Note:** In my experiments, I've let fine-tuning run for 70k iterations, although with hindsight it appears that improvement in mAP saturates at around 40k iterations.