docs: public void initialize(int[] graphVertexDegrees) {
          log.info("Initializing: Creating Huffman tree and lookup table...");
          GraphHuffman gh = new GraphHuffman(graphVertexDegrees.length);
          gh.buildTree(graphVertexDegrees);
          lookupTable = new InMemoryGraphLookupTable(graphVertexDegrees.length, vectorSize, gh, learningRate);
          initCalled = true;
          log.info("Initialization complete");
      }