# Path: sdopt/nodes/attributes.py
# class NodeAttr:
#     bounds    =  1
#     con_num   =  2
#     d_term    =  3
#     display   =  4
#     input_ord =  5
#     n_term    =  6
#     name      =  7
#     node_id   =  8
#     number    =  9
#     operation = 10
#     type      = 11
#     var_num   = 12
# 
# Path: sdopt/representation/dag_util.py
# def get_pretty_type_str(dag, n):
#     return dag.node[n][NodeAttr.type] + '_node'
# 
# Path: sdopt/util/stringIO.py

# 
# Path: sdopt/util/redirect_stdout.py
# @contextmanager
# def redirect_stdout(ostream):
#     oldstdout = sys.stdout
#     sys.stdout = ostream
#     try:
#         yield ostream
#     finally:
#         sys.stdout = oldstdout


import math
from operator import itemgetter
from string import Template
from contextlib import closing
from six.moves import zip as izip
from ..nodes.attributes import NodeAttr
from ..representation.dag_util import get_pretty_type_str
from ..util.stringIO import stringIO
from ..util.redirect_stdout import redirect_stdout
    assert NodeAttr.input_ord in d, '%d, %s' % (n, d)
    pred = d[NodeAttr.input_ord]
    assert len(pred)==1
    return sum_node_str(n, d, con_dag, base_vars)

def num_node_str(n, d, con_dag, base_vars):
    return str(d[NodeAttr.number])
###

def unchecked_inedge_mult(n, d, con_dag):
    pred = d[NodeAttr.input_ord]
    mult = [con_dag[p][n]['weight'] for p in pred]
    return mult, pred

def gen_inedge_mult(n, d, con_dag):
    return izip(*unchecked_inedge_mult(n, d, con_dag)) 

def binary_node_inedge_mult(n, d, con_dag):
    mult, pred = unchecked_inedge_mult(n, d, con_dag)
    assert sorted(pred)==sorted(con_dag.pred[n]),'%s\n%s'%(pred,con_dag.pred[n])
    assert len(pred)==2, 'Expected exactly two predecessors %s' % d    
    return mult, pred

################################################################################

def assign(seen, node):
    assign = '+=' if node in seen else '='
    seen.add(node)
    return assign     


# Path: sdopt/nodes/attributes.py
# class NodeAttr:
#     bounds    =  1
#     con_num   =  2
#     d_term    =  3
#     display   =  4
#     input_ord =  5
#     n_term    =  6
#     name      =  7
#     node_id   =  8
#     number    =  9
#     operation = 10
#     type      = 11
#     var_num   = 12
# 
# Path: sdopt/representation/dag_util.py
# def get_pretty_type_str(dag, n):
#     return dag.node[n][NodeAttr.type] + '_node'
# 
# Path: sdopt/util/stringIO.py

# 
# Path: sdopt/util/redirect_stdout.py
# @contextmanager
# def redirect_stdout(ostream):
#     oldstdout = sys.stdout
#     sys.stdout = ostream
#     try:
#         yield ostream
#     finally:
#         sys.stdout = oldstdout


# Path: sdopt/nodes/reverse_ad.py
import math
from operator import itemgetter
from string import Template
from contextlib import closing
from six.moves import zip as izip
from ..nodes.attributes import NodeAttr
from ..representation.dag_util import get_pretty_type_str
from ..util.stringIO import stringIO
from ..util.redirect_stdout import redirect_stdout

    assert NodeAttr.input_ord in d, '%d, %s' % (n, d)
    pred = d[NodeAttr.input_ord]
    assert len(pred)==1
    return sum_node_str(n, d, con_dag, base_vars)

def num_node_str(n, d, con_dag, base_vars):
    return str(d[NodeAttr.number])
###

def unchecked_inedge_mult(n, d, con_dag):
    pred = d[NodeAttr.input_ord]
    mult = [con_dag[p][n]['weight'] for p in pred]
    return mult, pred

def gen_inedge_mult(n, d, con_dag):
    return izip(*unchecked_inedge_mult(n, d, con_dag)) 

def binary_node_inedge_mult(n, d, con_dag):
    mult, pred = unchecked_inedge_mult(n, d, con_dag)
    assert sorted(pred)==sorted(con_dag.pred[n]),'%s\n%s'%(pred,con_dag.pred[n])
    assert len(pred)==2, 'Expected exactly two predecessors %s' % d    
    return mult, pred

################################################################################

def assign(seen, node):
    assign = '+=' if node in seen else '='
    seen.add(node)
    return assign     


def sum_node_rev(n, d, con_dag, base_vars, seen):