code: def filter(self, x, strict=False, allow_downcast=None):
      if isinstance(x, slice):
          return x
      else:
          raise TypeError("Expected a slice!")
  
imports: from __future__ import absolute_import, print_function, division
  import numpy
  import theano
  from theano.gof import Apply, Constant, Generic, Op, Type, hashtype
  from theano.gradient import DisconnectedType
label_desc: Use image node_id 1 for calling the SliceType obj's underlying member method code with example usage: obj.filter(x, strict, allow_downcast) and returns: x