CVXPY
Maximize
  Sum(x, None, False)
Subject To
 7: reshape(x, (4,), F) <= [1. 1. 1. 1.]
Bounds
 x free
End
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AFTER COMPILATION
Minimize
  - x_0 - x_1 - x_2 - x_3
Subject To
 R0: x_0 <= 1
 R1: x_1 <= 1
 R2: x_2 <= 1
 R3: x_3 <= 1
Bounds
 x_0 free
 x_1 free
 x_2 free
 x_3 free
End
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GUROBI
Maximize
  x[0] + x[1] + x[2] + x[3]
Subject To
 7[0]: x[0] <= 1
 7[1]: x[1] <= 1
 7[2]: x[2] <= 1
 7[3]: x[3] <= 1
Bounds
 x[0] free
 x[1] free
 x[2] free
 x[3] free
End