def find_best_step(err_vals):
    """
    Returns the index of the lowest of the passed values. Catches nans etc.
    """
    if np.all(np.isnan(err_vals)):
        raise ValueError('All err_vals are nans!')
    return np.nanargmin(err_vals)
def find_best_step(err_vals):
    
    if np.all(np.isnan(err_vals)):
        raise ValueError('All err_vals are nans!')
    return np.nanargmin(err_vals)
def find_best_step ( err_vals ) : if np . all ( np . isnan ( err_vals ) ) : raise ValueError ( 'All err_vals are nans!' ) return np . nanargmin ( err_vals )
Returns the index of the lowest of the passed values. Catches nans etc.
Returns the index of the lowest of the passed values . Catches nans etc .