code: def merge_states(x):
      x_shape = shape_list(x)
      new_x_shape = x_shape[:-2] + [np.prod(x_shape[-2:])]
      return tf.reshape(x, new_x_shape)
  
imports: import functools
  import numpy
  import tensorflow
  from finetune.optimizers.recompute_grads import recompute_grad
  from finetune.util.shapes import shape_list, lengths_from_eos_idx
  from finetune.nn.activations import act_fns
  from finetune.nn.nn_utils import dropout, norm
label_desc: Use image node_id 6 for calling a global function with example usage: merge_states(x) and returns: tf