update todo.md

TODO.md

@@ -4,17 +4,18 @@ Actions:
 
 * [X] trip distribution: gravity model
 * [X] Add save node and poi function
-* [X] user can update trip rate
-* [X] for zone file, change change column id to zone_id
+* [X] User can update trip rate
+* [X] For zone file, change id to zone_id
+* [ ] Production and Attraction calculation: if poi exits, calculate poi based demand. elif activity node exist, calculate activity_node based demand, else, 0
+* [ ] The calculated demands value are small -> change to 'reasonable' values
 * [ ] Add multiprocessing on zone centroid mapping with node and poi
 
-1. [ ] overall link: https://www.caliper.com/tctraveldemand.htm
-2. [ ] add load_zone_census_tracts
-3. [ ] trip generateion (Production and Attraction): 1) corss-classification method  2) Regression Methods  3) Discrete-Choice Methods
-4. [ ] mode choice: multinomial logit model, Nested logit model
+1. [ ] Overall link: https://www.caliper.com/tctraveldemand.htm
+2. [ ] Add load_zone_census_tracts
+3. [ ] Trip generateion (Production and Attraction): 1) corss-classification method  2) Regression Methods  3) Discrete-Choice Methods
+4. [ ] Mode choice: multinomial logit model, Nested logit model
     src: https://github.com/linhx25/MNLogit-zoo/tree/main ; https://github.com/ryonsd/choice-modeling;
-5. [ ] traffic assignment: All-or-nothing; STOCH ; Incremental assignment; Capacity Restraint; User  Equilibrium(Frank-Wolf method); Stochastic User Equilibrium (Method of Successive Averages, Sheffi and Powell, 1982; Sheffi, 1985); System optimum Assignment (SO);
+5. [ ] Traffic assignment: All-or-nothing; STOCH ; Incremental assignment; Capacity Restraint; User  Equilibrium(Frank-Wolf method); Stochastic User Equilibrium (Method of Successive Averages, Sheffi and Powell, 1982; Sheffi, 1985); System optimum Assignment (SO);
 6. [ ] Advanced Traffic Assignment: Alternative or user-defined volume delay function; HOV assignment; Multi-modal multi-class assignment(MMA);  Volume-Dependent Turning delays and signal opeimization traffic assignment; Combined trip distribution- assignment model; Create volume delay function DDLs
 7. [ ] Good source: https://github.com/joshchea/python-tdm/tree/master
 8. [ ] Link performance functions  t = $t_f [1 + \alpha(\dfrac{v}{c})^\beta)] $
-9. [ ] datacalss implementation (carefully)