This is not a real world indicator, but a simple demo of BPNN library, originally written in C++ and ported to MQL.
The demo shows training and testing a neural network for timeseries prediction.
Please find complete description of the neural network on the page of the original BPNN Predictor indicator, which uses DLL-library.
In this implementation the library and the indicator can be built natively in MQL5.
The source code can be compiled to a standalone ex5-library, which then should be imported to your MQL5-program. Or the source code can be included into your MQL5-program directly, hence the external library is not needed, because it's embedded into the program. The demo indicator can be built in both modes.
The files attached:
Include only one of the files: either BPNN_MQL_IMPL.mqh, or BPNN_MQL.mqh. Do not include both. If BPNN_MQL.mqh is included, make sure the library BPNN_MQL.mq5 is compiled beforehand.

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