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as long as I know, online learning takes actions at each time step (for each data), and one-pass algorithm just can see each data once. I already read Wikipedia: about streaming algorithms.

These algorithms have many similarities with online algorithms since they both require decisions to be made before all data are available, but they are not identical. Data stream algorithms only have limited memory available but they may be able to defer action until a group of points arrive, while online algorithms are required to take action as soon as each point arrives.

I still fail to understand how they are fundamentally different. both of them just see each data ones? and the difference is just about memory?

and I want to know is there any popular one-pass algorithm exist which I can compare my result with it? cause I already compare my result with online algorithms and I don't know if there is any difference or not?

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