code: def test_constructor(self):
      blocks = block_builder.Blocks()
      input_tensor = tf.zeros([3, 32, 32, 3])
      block_type = block_builder.BlockType.FIXED_CHANNEL_CONVOLUTION_16
      _ = blocks[block_type].block_build(
          [input_tensor], is_training=True
      )
  
file_path: model_search/model_search/block_builder_test.py
imports: from model_search import block_builder
  import tensorflow.compat.v2
label_desc: Use image node_id 1 for calling the BlocksBuilderTest obj's underlying member method code with example usage: obj.test_constructor() without return types