old_contents: """Manages Placeholders for Graph convolution networks.
  """
  from __future__ import print_function
  from __future__ import division
  from __future__ import unicode_literals
  
  __author__ = "Han Altae-Tran and Bharath Ramsundar"
  __copyright__ = "Copyright 2016, Stanford University"
  __license__ = "MIT"
  
  import warnings
  import numpy as np
  import tensorflow as tf
  from deepchem.nn.copy import Input
  from deepchem.feat.mol_graphs import ConvMol
  
  
  def merge_two_dicts(x, y):
    z = x.copy()
    z.update(y)
    return z
  
  
  def merge_dicts(l):
    """Convenience function to merge list of dictionaries."""
    merged = {}
    for dict in l:
      merged = merge_two_dicts(merged, dict)
    return merged
  
new_contents: """Manages Placeholders for Graph convolution networks.
  """
  from __future__ import print_function
  from __future__ import division
  from __future__ import unicode_literals
  
  __author__ = "Han Altae-Tran and Bharath Ramsundar"
  __copyright__ = "Copyright 2016, Stanford University"
  __license__ = "MIT"
  
  import warnings
  import numpy as np
  import tensorflow as tf
  from deepchem.feat.mol_graphs import ConvMol
  
  
  def merge_two_dicts(x, y):
    z = x.copy()
    z.update(y)
    return z
  
  
  def merge_dicts(l):
    """Convenience function to merge list of dictionaries."""
    merged = {}
    for dict in l:
      merged = merge_two_dicts(merged, dict)
    return merged
  
subject: Remove broken import