就是出现这样的Iteration 0: log likelihood = -129676.31 (not concave)Iteration 1: log likelihood = -128797.16 (not concave)
Iteration 2: log likelihood = -128240.27 (not concave)
Iteration 3: log likelihood = -127037.33 (not concave)
Iteration 4: log likelihood = -126416.13 (not concave)
Iteration 5: log likelihood = -126205.7 (not concave)
Iteration 6: log likelihood = -126050.11 (not concave)
Iteration 7: log likelihood = -126015.6 (not concave)
Iteration 8: log likelihood = -125991.15 (not concave)
Iteration 9: log likelihood = -125975.72 (not concave)
Iteration 10: log likelihood = -125960.32 (not concave)
Iteration 11: log likelihood = -125924.85 (not concave)
Iteration 12: log likelihood = -125917.24 (not concave)


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