This code is the test for FWI with different CG functions. method=1 HS function method=2 Dixon function method=3 CW function method=4 PRP function From the result, we can see that the HS function and PRP function works well.However the Dixon function and the CW function does not garentee converge. This may due to they reached in to a local minimum and can not get out out it, which means they provide poor direction for FWI. The implementation of Arjimo priciple can help Dixon functon and CW function to get out of the local minimum for sometimes, but when we increase the invertion iteration, Dixon and CW still can not get out of the local minimum. Meanwhile, method 2 and 3 are good ways to test the efficiency of Arjimo priciple.

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