class_docstr: The gradient of DiagonalSubtensor.
code: def connection_pattern(self, node):
      rval = [[True], [False], [False], [True]]
      return rval
  
imports: from __future__ import absolute_import, print_function, division
  import theano
  from theano.gradient import DisconnectedType
  from theano.gof import Op, Apply, TopoOptimizer
  from theano.gof.opt import copy_stack_trace
  from theano import tensor
label_desc: Use image node_id 6 for calling the IncDiagonalSubtensor obj's underlying member method code with example usage: obj.connection_pattern(node) and returns: rval