I want to generate a simple model and classify it with decision tree.

The idea is if numbers in an array are increasing then what I need is that.



these paterns like increasing will be predicted as true

and other then those will be predicted as false

How can I achieve this with decision trees?

  • 1
    $\begingroup$ Why do you think that you need ml for this? Is there something more to your question? $\endgroup$ Feb 13, 2020 at 4:12

2 Answers 2


Machine learning is not needed to solve that problem. This deterministic code tests if numbers in an array are increasing:

def strictly_increasing(nums):
    "Deterministically check for only increasing values"
    return all(x2 > x1 for x1, x2 in zip(nums, nums[1:]))

assert strictly_increasing([1, 2, 3])
assert strictly_increasing([2, 4.2, 5.6])
assert not strictly_increasing([1, 1, 1])
assert not strictly_increasing([3, 2, 1])


  1. Write a function which returns TRUE if the values in the input array are always increasing, FALSE otherwise.
  2. Optional: give the value returned by the function as feature to the classifier. The training requires only two examples, one true and one false.

Sorry I'm messing with you :)

Seriously, the point is: there's no interest at all to train a ML model for a problem which can easily be solved with an efficient deterministic algorithm. Use ML for problems which cannot be solved (or not as efficiently) without it.


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