From 076e104b8672924c3d80cd1da2fdb5ebee1766ac Mon Sep 17 00:00:00 2001
From: Douglas Rumbaugh <dbr4@psu.edu>
Date: Thu, 24 Aug 2023 17:00:31 -0400
Subject: Migrated over to using psudb-common utilities/headers

---
 include/ds/Alias.h | 72 ------------------------------------------------------
 1 file changed, 72 deletions(-)
 delete mode 100644 include/ds/Alias.h

(limited to 'include/ds/Alias.h')

diff --git a/include/ds/Alias.h b/include/ds/Alias.h
deleted file mode 100644
index 855dc75..0000000
--- a/include/ds/Alias.h
+++ /dev/null
@@ -1,72 +0,0 @@
-/*
- * include/ds/Alias.h
- *
- * Copyright (C) 2023 Douglas Rumbaugh <drumbaugh@psu.edu> 
- *                    Dong Xie <dongx@psu.edu>
- *
- * All rights reserved. Published under the Modified BSD License.
- *
- */
-#pragma once
-
-#include <gsl/gsl_rng.h>
-#include <vector>
-
-namespace de {
-
-/*
- * An implementation of Walker's Alias Structure for Weighted Set Sampling. Requires
- * that the input weight vector is already normalized.
- */
-class Alias {
-public:
-    Alias(const std::vector<double>& weights)
-    : m_alias(weights.size()), m_cutoff(weights.size()) {
-        size_t n = weights.size();
-        auto overfull = std::vector<size_t>();
-        auto underfull = std::vector<size_t>();
-        overfull.reserve(n);
-        underfull.reserve(n);
-
-        // initialize the probability_table with n*p(i) as well as the overfull and
-        // underfull lists.
-        for (size_t i = 0; i < n; i++) {
-            m_cutoff[i] = (double) n * weights[i];
-            if (m_cutoff[i] > 1) {
-                overfull.emplace_back(i);
-            } else if (m_cutoff[i] < 1) {
-                underfull.emplace_back(i);
-            } else {
-                m_alias[i] = i;
-            }
-        }
-
-        while (overfull.size() > 0 && underfull.size() > 0) {
-            auto i = overfull.back(); overfull.pop_back();
-            auto j = underfull.back(); underfull.pop_back();
-
-            m_alias[j] = i;
-            m_cutoff[i] = m_cutoff[i] + m_cutoff[j] - 1.0;
-
-            if (m_cutoff[i] > 1.0) {
-                overfull.emplace_back(i);
-            } else if (m_cutoff[i] < 1.0) {
-                underfull.emplace_back(i);
-            }
-        }
-    }
-
-    size_t get(const gsl_rng* rng) {
-        double coin1 = gsl_rng_uniform(rng);
-        double coin2 = gsl_rng_uniform(rng);
-
-        size_t k = ((double) m_alias.size()) * coin1;
-        return coin2 < m_cutoff[k] ? k : m_alias[k];
-    }
-
-private:
-    std::vector<size_t> m_alias;
-    std::vector<double> m_cutoff;
-};
-
-}
-- 
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