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--- |
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title: Accuracy and Top-k |
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--- |
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# Accuracy and Top-k |
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`Accuracy` scores the output as the accuracy of output with respect to target -- it is not actually a loss and has no backward step. |
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* Layer type: `Accuracy` |
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* [Doxygen Documentation](http://caffe.berkeleyvision.org/doxygen/classcaffe_1_1AccuracyLayer.html) |
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* Header: [`./include/caffe/layers/accuracy_layer.hpp`](https://github.com/BVLC/caffe/blob/master/include/caffe/layers/accuracy_layer.hpp) |
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* CPU implementation: [`./src/caffe/layers/accuracy_layer.cpp`](https://github.com/BVLC/caffe/blob/master/src/caffe/layers/accuracy_layer.cpp) |
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## Parameters |
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* Parameters (`AccuracyParameter accuracy_param`) |
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* From [`./src/caffe/proto/caffe.proto`](https://github.com/BVLC/caffe/blob/master/src/caffe/proto/caffe.proto)): |
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{% highlight Protobuf %} |
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{% include proto/AccuracyParameter.txt %} |
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{% endhighlight %} |
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