| --- |
| title: Database Layer |
| --- |
| |
| # Database Layer |
|
|
| * Layer type: `Data` |
| * [Doxygen Documentation](http://caffe.berkeleyvision.org/doxygen/classcaffe_1_1DataLayer.html) |
| * Header: [`./include/caffe/layers/data_layer.hpp`](https://github.com/BVLC/caffe/blob/master/include/caffe/layers/data_layer.hpp) |
| * CPU implementation: [`./src/caffe/layers/data_layer.cpp`](https://github.com/BVLC/caffe/blob/master/src/caffe/layers/data_layer.cpp) |
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|
| ## Parameters |
|
|
| * Parameters (`DataParameter data_param`) |
| * From [`./src/caffe/proto/caffe.proto`](https://github.com/BVLC/caffe/blob/master/src/caffe/proto/caffe.proto)): |
|
|
| {% highlight Protobuf %} |
| {% include proto/DataParameter.txt %} |
| {% endhighlight %} |
|
|
| * Parameters |
| - Required |
| - `source`: the name of the directory containing the database |
| - `batch_size`: the number of inputs to process at one time |
| - Optional |
| - `rand_skip`: skip up to this number of inputs at the beginning; useful for asynchronous sgd |
| - `backend` [default `LEVELDB`]: choose whether to use a `LEVELDB` or `LMDB` |
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