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o_guest's profile
Olivia Guest | Ολίβια Γκεστ
Olivia Guest | Ολίβια Γκεστ
Olivia Guest | Ολίβια Γκεστ
@o_guest

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Olivia Guest | Ολίβια Γκεστ

@o_guest

• goth gremlin • computational cognitive/neuroscience modeling • geek & techish Cypriot • plant aficionada • came up with #bropenscience • http://neuroplausible.com  •

Τότεναμ, Λονδίνο & Cyprus
olivia.science
Joined October 2015

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    1. Olivia Guest | Ολίβια Γκεστ‏ @o_guest 9 Mar 2017
      • Report Tweet

      Olivia Guest | Ολίβια Γκεστ Retweeted Olivia Guest | Ολίβια Γκεστ

      Would super appreciate help on this. I need to raise numbers to huge power (50+) & Python understandably overflows. Documentation is bad. 😣https://twitter.com/o_guest/status/839918241363410945 …

      Olivia Guest | Ολίβια Γκεστ added,

      Olivia Guest | Ολίβια Γκεστ @o_guest
      Has anybody used bigfloat or mpmath in #Python? I need to raise some floats to power (50+) & currently getting overflow error 34 —ideas? 😅
      2 replies 0 retweets 0 likes
    2. Alexander Clark‏ @alexandersclark 9 Mar 2017
      • Report Tweet
      Replying to @o_guest

      work with logs, And use numpy.logaddexp if you need to add. Or is that too obvious ?

      2 replies 0 retweets 2 likes
    3. Olivia Guest | Ολίβια Γκεστ‏ @o_guest 9 Mar 2017
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      Replying to @alexandersclark

      no it's not... Tell me more or link me? I'm currently running it just by casting to bigfloat where it was overflowing.

      1 reply 0 retweets 0 likes
      Olivia Guest | Ολίβια Γκεστ‏ @o_guest 9 Mar 2017
      • Report Tweet
      Replying to @o_guest @alexandersclark

      it looked like it was working so fingers crossed as I have left it running.

      11:45 AM - 9 Mar 2017
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Alexander Clark‏ @alexandersclark 9 Mar 2017
          • Report Tweet
          Replying to @o_guest

          take the logarithms of everything: google the log sum exp trick

          1 reply 0 retweets 1 like
        3. Olivia Guest | Ολίβια Γκεστ‏ @o_guest 9 Mar 2017
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          Replying to @alexandersclark

          Ahhhhhhh I see. Right I've left it running with big float, but will try what you said if it doesn't work. Or do you suspect

          1 reply 0 retweets 0 likes
        4. Olivia Guest | Ολίβια Γκεστ‏ @o_guest 9 Mar 2017
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          Replying to @o_guest @alexandersclark

          it's worth doing regardless?

          1 reply 0 retweets 0 likes
        5. Alexander Clark‏ @alexandersclark 9 Mar 2017
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          Replying to @o_guest

          depends on what you are doing .. are they probabilities ? There are other tricks to avoid underflow. Log is easy but inefficient

          1 reply 0 retweets 0 likes
        6. Olivia Guest | Ολίβια Γκεστ‏ @o_guest 9 Mar 2017
          • Report Tweet
          Replying to @alexandersclark

          it needs to be incredibly efficient as big data. It's actually a Luce choice weight.

          1 reply 0 retweets 0 likes
        7. Alexander Clark‏ @alexandersclark 9 Mar 2017
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          Replying to @o_guest

          if you are mostly multiplying them - or raising to powers - then logs are worth it.

          1 reply 0 retweets 1 like
        8. Olivia Guest | Ολίβια Γκεστ‏ @o_guest 9 Mar 2017
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          Replying to @alexandersclark

          yeah multiplying and raising

          0 replies 0 retweets 0 likes
        9. End of conversation

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