step_size_to_bound(x, s, lb, ub)
The function computes a positive scalar t, such that x + s * t is on the bound.
Computed step. Non-negative value.
Each element indicates whether a corresponding variable reaches the bound:
0 - the bound was not hit.
-1 - the lower bound was hit.
1 - the upper bound was hit.
Compute a min_step size required to reach a bound.
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