4 ms·

agree with you, apl is great for ML, see this 6 lines Neural Network Example by apl with no deps: https://github.com/ghosthamlet/ann.apl https://github.com/gho

agree with you, apl is great for ML, see this 6 lines Neural Network Example by apl with no deps: https://github.com/ghosthamlet/ann.apl https://github.com/ghosthamlet/ann.apl all code here: l0 ← 4 3 ⍴ 0 0 1 0 1 1 1 0 1 1 1 1 y ← 4 1 ⍴ 0 0 1 1 syn0 ← 3 1 ⍴ 0.5069797399 0.5703818579 0.9265880619 i ← 0 e ← 2.718281828459045 :While i < 10000 ⋄ i ← i + 1 ⋄ d ← l0 +.× syn0 ⋄ l1 ← 1 ÷ 1 + e * 0 - d ⋄ l1_err ← y - l1 ⋄ l1_delta ← l1_err × l1 × 1 - l1 ⋄ syn0 ← syn0 + (⍉ l0) +.× l1_delta ⋄ :EndWhile l1

ghosthamlet 10y ago
by the way, it is a ports from 11 lines python version here: http://iamtrask.github.io/2015/07/12/basic-python-network/ http://iamtrask.github.io/2015/07/12/basic-python-network/, isn't it more readable concise and beautiful than python version? if our all ML codes use apl, it will be a cool world.
- cwyers 10y ago
  > isn't it more readable concise and beautiful than python version? No.
  - minimaxir 10y ago
    To add to this, the which-loop-in-one-line-of-code is not self-documenting, which is important for data/ML in particular when others need to verify your code.
    - cwyers 10y ago
      And it's not any shorter in terms of statements, they're just using the diamond operator to put all the statements in the loop on one line.
- klibertp 10y ago
  It could simply be a badly written bit of APL. Although I don't know APL, I have some experience with J and I think the `:while` construct used here suggest more or less literal translation of the Python code.
Sean1708 10y ago
Is it possible to put that while loop on multiple lines? It looks like there are 6 different assignments in there, and trying to pick out what is happening is very hard when it's all on one line like that.
- Avshalom 10y ago
  You can break it up at each diamond but then you'd need to wrap it in a function which would be harder to cut and paste into a repl
rebootthesystem 10y ago
Hmmmm. This is a bad example of APL. Source: I used APL professionally for over ten years. For one thing, real APL does not have constructs like "while". That's the whole point of the language, to remove the need for the programmer to have to think this way. Also, this isn't, strictly speaking, six lines of code. The diamond is a statement separator. This is more like 15 or 20 lines (didn't count). Not that this is an important metric at all.
- sevensor 10y ago
  I'd be interested to know: for what kind of application did you use APL?
  - rebootthesystem 10y ago
    Quite a range, actually. From business applications to robotics and DNA sequencing.

ghosthamlet 10y ago

by the way, it is a ports from 11 lines python version here: http://iamtrask.github.io/2015/07/12/basic-python-network/ http://iamtrask.github.io/2015/07/12/basic-python-network/, isn't it more readable concise and beautiful than python version? if our all ML codes use apl, it will be a cool world.

cwyers 10y ago
> isn't it more readable concise and beautiful than python version? No.
- minimaxir 10y ago
  To add to this, the which-loop-in-one-line-of-code is not self-documenting, which is important for data/ML in particular when others need to verify your code.
  - cwyers 10y ago
    And it's not any shorter in terms of statements, they're just using the diamond operator to put all the statements in the loop on one line.
klibertp 10y ago
It could simply be a badly written bit of APL. Although I don't know APL, I have some experience with J and I think the `:while` construct used here suggest more or less literal translation of the Python code.

Sean1708 10y ago

Is it possible to put that while loop on multiple lines? It looks like there are 6 different assignments in there, and trying to pick out what is happening is very hard when it's all on one line like that.

Avshalom 10y ago
You can break it up at each diamond but then you'd need to wrap it in a function which would be harder to cut and paste into a repl

rebootthesystem 10y ago

Hmmmm. This is a bad example of APL. Source: I used APL professionally for over ten years. For one thing, real APL does not have constructs like "while". That's the whole point of the language, to remove the need for the programmer to have to think this way. Also, this isn't, strictly speaking, six lines of code. The diamond is a statement separator. This is more like 15 or 20 lines (didn't count). Not that this is an important metric at all.

sevensor 10y ago
I'd be interested to know: for what kind of application did you use APL?
- rebootthesystem 10y ago
  Quite a range, actually. From business applications to robotics and DNA sequencing.