TypeError: unhashable type: 'State'

[sasforce]

Dear Mr/Miss:
I have implemented your code, and something wrong happened:
TypeError: unhashable type: 'State'
Could you please tell me how does this happen and how can I fix it?
Thank you.
Sincerely Luo

[tobegit3hub]

Thanks for your response.

Can you show which script causes this error? How can we re-produce this problem? @sasforce

[guanzeying]

I have the same problem. my os: win7+python3.6, no cuda.

[YOUNG34]

Dear Mr/Miss:

I have the same problem, the inform shown in the terminal is as follows:

Play round: 1
Traceback (most recent call last):
File "mcst_example.py", line 296, in
main()
File "mcst_example.py", line 291, in main
current_node = monte_carlo_tree_search(current_node)
File "mcst_example.py", line 267, in monte_carlo_tree_search
expand_node = tree_policy(node)
File "mcst_example.py", line 153, in tree_policy
sub_node = expand(node)
File "mcst_example.py", line 192, in expand
while new_state in tried_sub_node_states:
File "mcst_example.py", line 67, in eq
if hash(self) == hash(other):
TypeError: unhashable type: 'State'

[YOUNG34]

Well, after I deleted the "def eq(self, other):" function at 66th line, and the "def repr(self):" at 72th line, this code worked.

[tobegit3hub]

Thanks for your response @guanzeying @YOUNG34 .
It would be the issue of compatibility of Python 2.7 and Python 3.0. I will have a look later or just remove the incompatible code.

[YOUNG34]

Just removing the "__eq__" function is enough, I made a stupid mistake to remove the "_repr_" function yesterday. Have a nice day. ?? Outlook for Android<https://aka.ms/ghei36>

…

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[charleschen6]

#6 (comment)
add below codes will correct the error.

class State(object):
  .....
  def __eq__(self, other):
    if isinstance(other, self.__class__):
      return (self.current_value, self.current_round_index, self.cumulative_choices) == \
             (other.current_value, other.current_round_index, other.cumulative_choices)
    else:
      return False

  def __hash__(self):
    return hash('{},{},{}'.format(self.current_value, self.current_round_index, self.cumulative_choices))