Xuan Lin

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Activity overview

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/upload-a-model/? 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 non-zero 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...