[add] decode context class to solve multi-threaded error

src/segmentor/decode_context.h

@@ -0,0 +1,47 @@
+#ifndef __LTP_SEGMENTOR_DECODE_CONTEXT_H__
+#define __LTP_SEGMENTOR_DECODE_CONTEXT_H__
+
+namespace ltp {
+namespace segmentor {
+
+class DecodeContext {
+public:
+  //! the gold features.
+  math::SparseVec correct_features;
+  //! the predicted features.
+  math::SparseVec predicted_features;
+  //!
+  math::SparseVec updated_features;
+
+  //! The feature cache.
+  math::Mat< math::FeatureVector *> uni_features;
+
+  DecodeContext() {}
+  ~DecodeContext() {}
+
+  void clear() {
+    if (uni_features.total_size() > 0) {
+      int d1 = uni_features.nrows();
+      int d2 = uni_features.ncols();
+      for (int i = 0; i < d1; ++ i) {
+        if (uni_features[i][0]) {
+          uni_features[i][0]->clear();
+        }
+        for (int j = 0; j < d2; ++ j) {
+          if (uni_features[i][j]) {
+            delete uni_features[i][j];
+          }
+        }
+      }
+    }
+
+    uni_features.dealloc();
+    correct_features.zero();
+    predicted_features.zero();
+  }
+};
+
+} //  end for namespace segmentor
+} //  end for namespace ltp
+
+#endif  //  end for __LTP_SEGMENTOR_DECODE_CONTEXT_H__