Xuan Lin
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Latest activity by Xuan Lin
Xuan Lin commented,
Hi Riley, Yes, what you said is correct, that is why the code I put here is a simplified model for debugging purposes. I have the complete model (~400 lines) that sets lb=ub to various nonzero valu...

Xuan Lin commented,
Hi Riley, Thanks for the feedback and suggestions! I apologize for the complicated code, as I tried to keep the structure of the model to represent the original one. The x0_new[i_x] is always 0  t...

Xuan Lin commented,
Hi Riley, Does this work: https://drive.google.com/file/d/1vSNy0fVahVJsfrReZzjI9lfIXBEe7sUW/view?usp=sharing? I use the following code to read it into list of np.array: import csvfeas_cuts_offline ...

Xuan Lin commented,
Hi Riley, My apologies for this super late reply. I have condensed my code but unfortunately, it still have ~150 lines. I use the x0=0 initial condition and run for 10 times. This code has 2 models...

Xuan Lin commented,
Hi Riley, Could you confirm that I should submit the model through uploading port such as https://www.gurobi.com/uploadamodel/? Thank you!  Xuan

Xuan Lin commented,
Hi Riley, I am unsure how many constraints lead to a highly constrained problem, but my model is relatively small (has like 20 binary variables, hence can solve fast) and has more than 700 constrai...

Xuan Lin commented,
Hi Riley, In addition to what I put down above, it seems both models give: Statistics for modelPresolved: Linear constraint matrix : 0 Constrs, 0 Vars, 0 NZs Matrix coefficient range : [ 0,...

Xuan Lin commented,
Hi Riley, I only build the model once and the later runs I modify the model. Therefore, I believe MIP start is automatically generated inside Gurobi.  Xuan

Xuan Lin commented,
Hi Riley, The variable x0 is a vector with 4 elements, that is why there are 4 additional columns. There are ~700 constraints, hence the additional 3000 nonzero terms. I was trying to run the same...

Xuan Lin commented,
Hi Riley, Sorry when I made that comment my mind was not very clear. I made a small test code using some data collected from my experiment, and still observe the difference of speed. The same thing...