Files
tinygrad/extra
chenyu e641bbc859 safe softmax trick in MCTS ucb_explored_children (#7515)
* safe softmax trick in MCTS ucb_explored_children

fixed
```
  File "numpy/random/mtrand.pyx", line 971, in numpy.random.mtrand.RandomState.choice
ValueError: probabilities contain NaN
```
when all ucb_explored_children are big negative numbers result in all NaN probabilities

* better type
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