code: def _char_to_onehot(self, input_char, onehot_dim):
      input_ont_hot = F.one_hot(input_char, onehot_dim)
      return input_ont_hot
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import paddle
  import paddle.nn
  import paddle.nn.functional
  import numpy
label_desc: Use image node_id 2 for calling the AttentionHead obj's underlying member method code with example usage: obj._char_to_onehot(input_char, onehot_dim) and returns: input_ont_hot