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I generated an ngram model from a .arpa file with the following command:
ngramread --ARPA lm.arpa > lm.model
ngramread does not complain, but ngraminfo and trying to load the model from C++ code generate the following error:
FATAL: NGramModel: bad ngram model topology
How can I troubleshoot the problem?
Hi,
that error is coming from a sanity check that verifies that every state in the language model (other than the start and unigram states) is reached by exactly one 'ascending' arc, that goes from a lower order to a higher order state. ARPA format models can diverge from this, by, for example, having 'holes' (e.g., bigrams pruned but trigrams with that bigram as a suffix retained). But ngramread should plug all of those. maybe duplication? I'll email you about this.
-- CyrilAllauzen - 09 Aug 2012