From 8c26c195213805face566a6407597ba2a871a122 Mon Sep 17 00:00:00 2001
From: "Wu, Ke" <wuke@cs.umd.edu>
Date: Tue, 7 Oct 2014 18:44:05 -0400
Subject: Move synutils under utils

---
 utils/tsuruoka_maxent.h | 155 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 155 insertions(+)
 create mode 100644 utils/tsuruoka_maxent.h

(limited to 'utils/tsuruoka_maxent.h')

diff --git a/utils/tsuruoka_maxent.h b/utils/tsuruoka_maxent.h
new file mode 100644
index 00000000..e6bef232
--- /dev/null
+++ b/utils/tsuruoka_maxent.h
@@ -0,0 +1,155 @@
+/*
+ * tsuruoka_maxent.h
+ *
+ */
+
+#ifndef TSURUOKA_MAXENT_H_
+#define TSURUOKA_MAXENT_H_
+
+#include "synutils.h"
+#include "stringlib.h"
+#include "maxent.h"
+
+#include <assert.h>
+#include <vector>
+#include <string>
+#include <string.h>
+#include <unordered_map>
+
+using namespace std;
+
+typedef std::unordered_map<std::string, int> Map;
+typedef std::unordered_map<std::string, int>::iterator Iterator;
+
+struct Tsuruoka_Maxent {
+  Tsuruoka_Maxent(const char* pszModelFName) {
+    if (pszModelFName != NULL) {
+      m_pModel = new ME_Model();
+      m_pModel->load_from_file(pszModelFName);
+    } else
+      m_pModel = NULL;
+  }
+
+  ~Tsuruoka_Maxent() {
+    if (m_pModel != NULL) delete m_pModel;
+  }
+
+  void fnTrain(const char* pszInstanceFName, const char* pszAlgorithm,
+               const char* pszModelFName, int iNumIteration) {
+    assert(strcmp(pszAlgorithm, "l1") == 0 || strcmp(pszAlgorithm, "l2") == 0 ||
+           strcmp(pszAlgorithm, "sgd") == 0 ||
+           strcmp(pszAlgorithm, "SGD") == 0);
+    FILE* fpIn = fopen(pszInstanceFName, "r");
+
+    ME_Model* pModel = new ME_Model();
+
+    char* pszLine = new char[100001];
+    int iNumInstances = 0;
+    int iLen;
+    while (!feof(fpIn)) {
+      pszLine[0] = '\0';
+      fgets(pszLine, 20000, fpIn);
+      if (strlen(pszLine) == 0) {
+        continue;
+      }
+
+      iLen = strlen(pszLine);
+      while (iLen > 0 && pszLine[iLen - 1] > 0 && pszLine[iLen - 1] < 33) {
+        pszLine[iLen - 1] = '\0';
+        iLen--;
+      }
+
+      iNumInstances++;
+
+      ME_Sample* pmes = new ME_Sample();
+
+      char* p = strrchr(pszLine, ' ');
+      assert(p != NULL);
+      p[0] = '\0';
+      p++;
+      vector<string> vecContext;
+      SplitOnWhitespace(string(pszLine), &vecContext);
+
+      pmes->label = string(p);
+      for (size_t i = 0; i < vecContext.size(); i++)
+        pmes->add_feature(vecContext[i]);
+      pModel->add_training_sample((*pmes));
+      if (iNumInstances % 100000 == 0)
+        fprintf(stdout, "......Reading #Instances: %1d\n", iNumInstances);
+      delete pmes;
+    }
+    fprintf(stdout, "......Reading #Instances: %1d\n", iNumInstances);
+    fclose(fpIn);
+
+    if (strcmp(pszAlgorithm, "l1") == 0)
+      pModel->use_l1_regularizer(1.0);
+    else if (strcmp(pszAlgorithm, "l2") == 0)
+      pModel->use_l2_regularizer(1.0);
+    else
+      pModel->use_SGD();
+
+    pModel->train();
+    pModel->save_to_file(pszModelFName);
+
+    delete pModel;
+    fprintf(stdout, "......Finished Training\n");
+    fprintf(stdout, "......Model saved as %s\n", pszModelFName);
+    delete[] pszLine;
+  }
+
+  double fnEval(const char* pszContext, const char* pszOutcome) const {
+    vector<string> vecContext;
+    ME_Sample* pmes = new ME_Sample();
+    SplitOnWhitespace(string(pszContext), &vecContext);
+
+    for (size_t i = 0; i < vecContext.size(); i++)
+      pmes->add_feature(vecContext[i]);
+    vector<double> vecProb = m_pModel->classify(*pmes);
+    delete pmes;
+    int iLableID = m_pModel->get_class_id(pszOutcome);
+    return vecProb[iLableID];
+  }
+  void fnEval(const char* pszContext,
+              vector<pair<string, double> >& vecOutput) const {
+    vector<string> vecContext;
+    ME_Sample* pmes = new ME_Sample();
+    SplitOnWhitespace(string(pszContext), &vecContext);
+
+    vecOutput.clear();
+
+    for (size_t i = 0; i < vecContext.size(); i++)
+      pmes->add_feature(vecContext[i]);
+    vector<double> vecProb = m_pModel->classify(*pmes);
+
+    for (size_t i = 0; i < vecProb.size(); i++) {
+      string label = m_pModel->get_class_label(i);
+      vecOutput.push_back(make_pair(label, vecProb[i]));
+    }
+    delete pmes;
+  }
+  void fnEval(const char* pszContext, vector<double>& vecOutput) const {
+    vector<string> vecContext;
+    ME_Sample* pmes = new ME_Sample();
+    SplitOnWhitespace(string(pszContext), &vecContext);
+
+    vecOutput.clear();
+
+    for (size_t i = 0; i < vecContext.size(); i++)
+      pmes->add_feature(vecContext[i]);
+    vector<double> vecProb = m_pModel->classify(*pmes);
+
+    for (size_t i = 0; i < vecProb.size(); i++) {
+      string label = m_pModel->get_class_label(i);
+      vecOutput.push_back(vecProb[i]);
+    }
+    delete pmes;
+  }
+  int fnGetClassId(const string& strLabel) const {
+    return m_pModel->get_class_id(strLabel);
+  }
+
+ private:
+  ME_Model* m_pModel;
+};
+
+#endif /* TSURUOKA_MAXENT_H_ */
-- 
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