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(PECL fann >= 1.0.0)
fann_set_rprop_delta_max — Sets the maximum step-size
$ann 
   ,  float $rprop_delta_max 
   )The maximum step-size is a positive number determining how large the maximum step-size may be.
ann Neural network resource .
rprop_delta_max The maximum step-size.
Returns  TRUE  on success, or  FALSE  otherwise.