code: def _sigmoid_norm(score):
      attn_weights = tf.nn.sigmoid(score)
      attn_weights = attn_weights / tf.reduce_sum(
          attn_weights, axis=1, keepdims=True
      )
      return attn_weights
  
imports: import tensorflow
  from tensorflow import keras
  from tensorflow.python.ops import math_ops
label_desc: Use image node_id 1 for calling a global function with example usage: _sigmoid_norm(score) and returns: attn_weights