From 113317266853abff2e1c0c3e889017d0eee55c93 Mon Sep 17 00:00:00 2001
From: Chris Dyer <cdyer@cs.cmu.edu>
Date: Fri, 9 Mar 2012 22:23:50 -0500
Subject: moar

---
 utils/ccrp_nt.h | 17 ++++++-----------
 1 file changed, 6 insertions(+), 11 deletions(-)

(limited to 'utils')

diff --git a/utils/ccrp_nt.h b/utils/ccrp_nt.h
index 79321493..6efbfc78 100644
--- a/utils/ccrp_nt.h
+++ b/utils/ccrp_nt.h
@@ -11,6 +11,7 @@
 #include <boost/functional/hash.hpp>
 #include "sampler.h"
 #include "slice_sampler.h"
+#include "m.h"
 
 // Chinese restaurant process (1 parameter)
 template <typename Dish, typename DishHash = boost::hash<Dish> >
@@ -29,6 +30,7 @@ class CCRP_NoTable {
     alpha_prior_rate_(c_rate) {}
 
   double alpha() const { return alpha_; }
+  void set_alpha(const double& alpha) { alpha_ = alpha; assert(alpha_ > 0.0); }
 
   bool has_alpha_prior() const {
     return !std::isnan(alpha_prior_shape_);
@@ -71,9 +73,10 @@ class CCRP_NoTable {
     return table_diff;
   }
 
-  double prob(const Dish& dish, const double& p0) const {
+  template <typename F>
+  F prob(const Dish& dish, const F& p0) const {
     const unsigned at_table = num_customers(dish);
-    return (at_table + p0 * alpha_) / (num_customers_ + alpha_);
+    return (F(at_table) + p0 * F(alpha_)) / F(num_customers_ + alpha_);
   }
 
   double logprob(const Dish& dish, const double& logp0) const {
@@ -85,20 +88,12 @@ class CCRP_NoTable {
     return log_crp_prob(alpha_);
   }
 
-  static double log_gamma_density(const double& x, const double& shape, const double& rate) {
-    assert(x >= 0.0);
-    assert(shape > 0.0);
-    assert(rate > 0.0);
-    const double lp = (shape-1)*log(x) - shape*log(rate) - x/rate - lgamma(shape);
-    return lp;
-  }
-
   // taken from http://en.wikipedia.org/wiki/Chinese_restaurant_process
   // does not include P_0's
   double log_crp_prob(const double& alpha) const {
     double lp = 0.0;
     if (has_alpha_prior())
-      lp += log_gamma_density(alpha, alpha_prior_shape_, alpha_prior_rate_);
+      lp += Md::log_gamma_density(alpha, alpha_prior_shape_, alpha_prior_rate_);
     assert(lp <= 0.0);
     if (num_customers_) {
       lp += lgamma(alpha) - lgamma(alpha + num_customers_) +
-- 
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