CTC error for a wrong batch_size (expected - 2 , given - 4)

decodes, _ = tf.nn.ctc_beam_search_decoder(inputs=net_out, sequence_length=25*np.ones(4), merge_repeated=False)

Caused by op u'CTCBeamSearchDecoder', defined at:
  File "tools/export_crnn_model_script.py", line 266, in <module>
    recognize(image_path=args.image_path, weights_path=args.weights_path)
  File "tools/export_crnn_model_script.py", line 136, in recognize
    decodes, _ = tf.nn.ctc_beam_search_decoder(inputs=net_out, sequence_length=25*np.ones(4), merge_repeated=False)
  File "/home/sathish/anaconda2/lib/python2.7/site-packages/tensorflow/python/ops/ctc_ops.py", line 277, in ctc_beam_search_decoder
    merge_repeated=merge_repeated))
  File "/home/sathish/anaconda2/lib/python2.7/site-packages/tensorflow/python/ops/gen_ctc_ops.py", line 73, in ctc_beam_search_decoder
    top_paths=top_paths, merge_repeated=merge_repeated, name=name)
  File "/home/sathish/anaconda2/lib/python2.7/site-packages/tensorflow/python/framework/op_def_library.py", line 787, in _apply_op_helper
    op_def=op_def)
  File "/home/sathish/anaconda2/lib/python2.7/site-packages/tensorflow/python/framework/ops.py", line 3392, in create_op
    op_def=op_def)
  File "/home/sathish/anaconda2/lib/python2.7/site-packages/tensorflow/python/framework/ops.py", line 1718, in __init__
    self._traceback = self._graph._extract_stack()  # pylint: disable=protected-access

FailedPreconditionError (see above for traceback): len(sequence_length) != batch_size.  len(sequence_length):  4 batch_size: 2
         [[Node: CTCBeamSearchDecoder = CTCBeamSearchDecoder[beam_width=100, merge_repeated=false, top_paths=1, _device="/job:localhost/replica:0/task:0/device:CPU:0"](shadow/Print, CTCBeamSearchDecoder/sequence_length)]]