Program: 39204
Project: 39204
Buggy source:
/** 
 * Environment step that checks for moves that won't work and gives the appropriate errors. Then, checks for a moving block, continues to the next movement or adds the next block. It also connects reward with the game state, checking for game overs and the current score
 * @param actionObject action to perform
 * @return reward and observation details
 */
@Override public Reward_observation_terminal env_step(Action actionObject){
  int theAction=0;
  try {
    theAction=actionObject.intArray[0];
  }
 catch (  ArrayIndexOutOfBoundsException e) {
    System.err.println("String_Node_Str" + e);
    System.err.println("String_Node_Str");
    theAction=0;
  }
  if (theAction > 5 || theAction < 0) {
    System.err.println("String_Node_Str" + theAction);
    theAction=gameState.getRandom().nextInt(5);
  }
  if (gameState.blockMobile) {
    gameState.take_action(theAction);
    gameState.update();
  }
 else {
    double numEmpty=gameState.numEmptySpaces();
    averageNumEmptyBlocks+=(numEmpty - averageNumEmptyBlocks) / (++numBlockPlacements);
    gameState.spawn_block();
  }
  Reward_observation_terminal ro=new Reward_observation_terminal();
  ro.terminal=1;
  ro.o=gameState.get_observation();
  if (!gameState.gameOver()) {
    ro.terminal=0;
    ro.r=gameState.get_score() - currentScore;
    if (ro.r == 1) {
      rowsOf1++;
      linesCleared+=1;
    }
 else     if (ro.r == 2) {
      rowsOf2++;
      linesCleared+=2;
    }
 else     if (ro.r == 4) {
      rowsOf3++;
      linesCleared+=3;
    }
 else     if (ro.r == 8) {
      rowsOf4++;
      linesCleared+=4;
    }
    currentScore=gameState.get_score();
  }
 else {
    ro.r=Tetris.terminalScore;
    currentScore=0;
    linesCleared=0;
  }
  return ro;
}

Fixed version (ground truth):
/** 
 * Environment step that checks for moves that won't work and gives the appropriate errors. Then, checks for a moving block, continues to the next movement or adds the next block. It also connects reward with the game state, checking for game overs and the current score
 * @param actionObject action to perform
 * @return reward and observation details
 */
@Override public Reward_observation_terminal env_step(Action actionObject){
  int theAction=0;
  try {
    theAction=actionObject.intArray[0];
  }
 catch (  ArrayIndexOutOfBoundsException e) {
    System.err.println("String_Node_Str" + e);
    System.err.println("String_Node_Str");
    theAction=0;
  }
  if (theAction > 5 || theAction < 0) {
    System.err.println("String_Node_Str" + theAction);
    theAction=gameState.getRandom().nextInt(5);
  }
  if (gameState.blockMobile) {
    gameState.take_action(theAction);
    gameState.update();
  }
 else {
    double numEmpty=gameState.numEmptySpaces();
    averageNumEmptyBlocks+=(numEmpty - averageNumEmptyBlocks) / (++numBlockPlacements);
    gameState.spawn_block();
  }
  Reward_observation_terminal ro=new Reward_observation_terminal();
  ro.terminal=1;
  ro.o=gameState.get_observation();
  if (!gameState.gameOver()) {
    ro.terminal=0;
    ro.r=gameState.get_score() - currentScore;
    if (ro.r == 1) {
      rowsOf1++;
      linesCleared+=1;
    }
 else     if (ro.r == 2) {
      rowsOf2++;
      linesCleared+=2;
    }
 else     if (ro.r == 4) {
      rowsOf3++;
      linesCleared+=3;
    }
 else     if (ro.r == 8) {
      rowsOf4++;
      linesCleared+=4;
    }
    currentScore=gameState.get_score();
  }
 else {
    ro.r=Tetris.terminalScore;
    currentScore=0;
  }
  return ro;
}