bug

[jakekrell]

• evaluating at a single point of a GP trained on single input variable produces error
  • xvec = (n,) vector
  • GP.fit(xvec, yvec, clean=True)
  • GP.evaluate(xvec[i], clean=True) and GP.evaluate(xvec[i], clean=True) produce error
  • [xvec[i]] instead of xvec[i] is the fix, but should be handled internally (i.e., not required by user when calling evaluate)