From 38f28be7cd2bada87ebad78994e3c938e10c2cce Mon Sep 17 00:00:00 2001
From: Chris Dyer <cdyer@cs.cmu.edu>
Date: Sat, 10 Mar 2012 12:56:15 -0500
Subject: ready to infer alignment parameters

---
 gi/pf/tied_resampler.h | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

(limited to 'gi/pf/tied_resampler.h')

diff --git a/gi/pf/tied_resampler.h b/gi/pf/tied_resampler.h
index 208fb9c7..5a262f9d 100644
--- a/gi/pf/tied_resampler.h
+++ b/gi/pf/tied_resampler.h
@@ -2,6 +2,7 @@
 #define _TIED_RESAMPLER_H_
 
 #include <set>
+#include <vector>
 #include "sampler.h"
 #include "slice_sampler.h"
 #include "m.h"
@@ -28,6 +29,10 @@ struct TiedResampler {
     crps.erase(crp);
   }
 
+  size_t size() const {
+    return crps.size();
+  }
+
   double LogLikelihood(double d, double s) const {
     if (s <= -d) return -std::numeric_limits<double>::infinity();
     double llh = Md::log_beta_density(d, d_alpha, d_beta) +
@@ -54,6 +59,7 @@ struct TiedResampler {
   };
 
   void ResampleHyperparameters(MT19937* rng, const unsigned nloop = 5, const unsigned niterations = 10) {
+    if (size() == 0) { std::cerr << "EMPTY - not resampling\n"; return; }
     const DiscountResampler dr(*this);
     const AlphaResampler ar(*this);
     for (int iter = 0; iter < nloop; ++iter) {
@@ -79,4 +85,29 @@ struct TiedResampler {
   double discount, strength;
 };
 
+// split according to some criterion
+template <class CRP>
+struct BinTiedResampler {
+  explicit BinTiedResampler(unsigned nbins) :
+      resamplers(nbins, TiedResampler<CRP>(1,1,1,1)) {}
+
+  void Add(unsigned bin, CRP* crp) {
+    resamplers[bin].Add(crp);
+  }
+
+  void Remove(unsigned bin, CRP* crp) {
+    resamplers[bin].Remove(crp);
+  }
+
+  void ResampleHyperparameters(MT19937* rng) {
+    for (unsigned i = 0; i < resamplers.size(); ++i) {
+      std::cerr << "BIN " << i << " (" << resamplers[i].size() << " CRPs): " << std::flush;
+      resamplers[i].ResampleHyperparameters(rng);
+    }
+  }
+
+ private:
+  std::vector<TiedResampler<CRP> > resamplers;
+};
+
 #endif
-- 
cgit v1.2.3