example.dot

digraph G {
rankdir="LR";
  
  subgraph cluster_3{
      subgraph cluster_2 {
        style=filled;
        color=lightgrey;
        node [style=filled,color=white];
        VS -> "top-K"->"sequential \n embeding"
        label = "CWSE";
        labeljust="l";
     }
      subgraph cluster_1 {
        style=filled;
        color=lightgrey;
        node [style=filled,color=white];
        encoding -> b
        b[label="clustering"]
        label = "core words don't exist";
        labeljust="l";
    }
      subgraph cluster_0 {
        style=filled;
        color=lightgrey;
        node [style=filled,color=white];
          a
        a [label="clustering"]
        label = "core words exist";
        labeljust="l";
    }
    label = "pairs to intents clustering";
    labeljust="l";
  }
  
  start-> preprocessing
  preprocessing -> VS
  "sequential \n embeding"-> a
  "sequential \n embeding" -> encoding
  a->merge
  b->merge
  merge->MBLST
  MBLST->end
  
  start[style = invis]
  end[style=invis]

}