Attributes

1. N: Number of hidden states.
2. M: Number of observation symbols.
3. pi[i]: Initial probability of the $i$-th hidden state.
4. A[i][j]: Transition probability from hidden state $i$ to hidden state $j$.
5. p[i][j][k]: Transition probability of symbol $j$ to symbol $k$ in hidden state $i$.
6. r[i][j]: Initial probability of symbol $j$ in hidden state $i$.