Predecessor patch #15
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2023/02/03
the key "target" may not be in the predecessor
check if key in the predecessor or not before the "get" occurs
Decoupling get_predecessor and viterbi_search
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The coupling issue arises in the viterbi_search function due to its reliance on the get_predecessor function. One concern with this coupling is within the get_predecessor function, where a key is retrieved from a dictionary using the get operation. The key might not always exist in the dictionary, but I've implemented a check in get_predecessor to ensure the program won't crash if attempting to get a non-existent key. In such cases, get_predecessor will return an empty dictionary.
I've also added comments in the viterbi_search function to emphasize that get_predecessor should be used separately. Additionally, it's crucial to verify whether the returned predecessor is empty after calling get_predecessor.