This function evaluates the forecast result in several evaluation criterions.
| 1 | flow_evaluate(rv, pv, method = "all")
 | 
| rv | real value of traffic flow, a row from a dataframe; | 
| pv | forecast value, can be the return value of flow_knn function, a row from a dataframe; | 
| method | can be "mse", "rmse", "mae" or "all" | 
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