code: def __call__(self, query, key_value):
      output = nn.MultiHeadDotProductAttention(
          num_heads=self.num_heads, qkv_features=self.qkv_features
      )(query, key_value)
      return dict(query=output, key_value=key_value)
  
imports: from typing import Any, Optional, Sequence
  import jax
  import numpy
  from absl.testing import absltest
  from jax import numpy
  from jax import random
  from flax import linen
label_desc: Use image node_id 1 for calling the AttentionDict obj's underlying member method code with example usage: obj.__call__(query, key_value) and returns: dict