Errors in the textbook

[kato8966]

Dear Professor Eisenstein,

I found some errors in the printed version of Introduction to Natural Language Processing.

• On Notation (page xiii), the base of the exponential and logarithm should be e because the base-2 exponent and the base-2 logarithm do not satisfy (\exp x)' = \exp x and (\log x)' = 1 / x, respectively, which are used in, for example, equation [2.26].
• On Exercise 5-5, 'This is the "direct transfer" baseline' should be appended to the first bullet item.
• On Exercise 6-9, the definition of the Riemann zeta function is \sum_{r = 1}^\infty r^{-s}.
• In Algorithm 11 (on page 142),
  • On lines 1 and 4, k iterates from 0 to K, but it means that there are K + 1 tags. Also, there is a missing comma on line 1.
  • On line 9, b_m should be b_{m+1}.
• On equation [7.86], n (both in the numerator and the denominator) should iterate until M + 1.
• On equation [7.88], n should start from m + 1. And the following equation must be \sum_{k' \in \mathcal{Y}} \exp s_{m + 1}(k', k)\sum_{\boldsymbol{y}_{m + 1: M}: Y_{m + 1} = k'} \prod_{n = m + 2}^{M + 1} \exp s_n(y_n, y_{n - 1}).

With best regards,

Katô Taisei

[xxspurs]

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