Twitter Recommendation Algorithm

Please note we have force-pushed a new initial commit in order to remove some publicly-available Twitter user information. Note that this process may be required in the future.

navi/segdense/src/mapper.rs

@@ -0,0 +1,45 @@
+use std::collections::HashMap;
+
+#[derive(Debug)]
+pub struct FeatureInfo {
+    pub tensor_index: i8,
+    pub index_within_tensor: i64,
+}
+
+pub static NULL_INFO: FeatureInfo = FeatureInfo {
+    tensor_index: -1,
+    index_within_tensor: -1,
+};
+
+#[derive(Debug, Default)]
+pub struct FeatureMapper {
+    map: HashMap<i64, FeatureInfo>,
+}
+
+impl FeatureMapper {
+    pub fn new() -> FeatureMapper {
+        FeatureMapper {
+            map: HashMap::new()
+        }
+    }
+}
+
+pub trait MapWriter {
+    fn set(&mut self, feature_id: i64, info: FeatureInfo); 
+}
+
+pub trait MapReader {
+    fn get(&self, feature_id: &i64) -> Option<&FeatureInfo>;
+}
+
+impl MapWriter for FeatureMapper {
+    fn set(&mut self, feature_id: i64, info: FeatureInfo) {
+        self.map.insert(feature_id, info);
+    }
+}
+
+impl MapReader for FeatureMapper {
+    fn get(&self, feature_id: &i64) -> Option<&FeatureInfo> {
+        self.map.get(feature_id)
+    }
+}