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I'm having a response like below from FANN

Epochs 1. Current error: 0.2500066161. Bit fail 4. 

Epochs 58. Current error: 0.0000930788. Bit fail 0.

what does Bit fail mean here?

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The number of fail bits; means the number of output neurons that differ more than the bit fail limit (see fann_get_bit_fail_limit, fann_set_bit_fail_limit).  

The bits are counted in all of the training data, so this number can be higher than the number of training data.

This value is now reset by fann_reset_MSE and then updated by all the same functions which also updates the MSE value (e.g.  fann_test_data, fann_train_epoch)

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