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---
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)
## 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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