class_docstr: Tests the `BasicDecoder` class.
    
class_docstr_tok: ["Tests","the","`","BasicDecoder","`","class","."]
code: def setUp(self):
      tf.test.TestCase.setUp(self)
      tf.logging.set_verbosity(tf.logging.INFO)
      DecoderTests.__init__(self)
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from __future__ import unicode_literals
  import tensorflow
  import numpy
  from seq2seq.decoders import BasicDecoder, AttentionDecoder, AttentionLayerDot
  from seq2seq.decoders import beam_search_decoder
  from seq2seq.inference import beam_search
  from seq2seq.contrib.seq2seq import helper
label_desc: Use image node_id 1 for calling the BasicDecoderTest obj's underlying member method code with example usage: obj.setUp() without return types