Baum welch Training to get HMM Paramater

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How to get HMM parameters using baum welch training? I am new to HMM and I have seen a few tutorials explaining its concept but there is not a proper explanation on how to implement it. Can somebody guide me on how to train my training data with HMM. I know the first step is to use Baum Welch alhorithm to get emission matrix and transitions matrix but how to do it?Please help me.