code: @Override
      public boolean storeIfAbsent(T key, INDArray object) {
          try {
              if (emulateIsAbsent)
                  lock.writeLock().lock();
  
              if (compressedEntries.containsKey(key)) {
                  return false;
              } else {
                  store(key, object);
                  return true;
              }
          } finally {
              if (emulateIsAbsent)
                  lock.writeLock().unlock();
          }
      }
docs: Store object into storage, if it doesn't exist
  
  @param key
  @param object
  @return Returns TRUE if store operation was applied, FALSE otherwise