code: def n_hot(ids, c):
      '''
      one hot encoding by index. Returns array of length c, where all entries are 0, except for the indecies in ids
      '''
      res = np.zeros((c,), dtype=np.float32)
      res[ids] = 1
      return ref n_hot(ids, c):
      '''
      one hot encoding by index. Returns array of length c, where all entries are 0, except for the indecies in ids
      '''
      res = np.zeros((c,), dtype=np.float32)
      res[ids] = 1
      return res
docs: one hot encoding by index. Returns array of length c, where all entries are 0, except for the indecies in ids