Returns true if the datapoint has a different value from the previous one
The changed transform returns true if the current datapoint’s data is different from the previous datapoint.
Given the following data:
changed transform on it will result in:
changed transform is useful whenever you don’t care about the specific datapoints,
but when they change with respect to a certain metric.
Suppose you have a stream of activities gathered by a phone:
You usually care about the transitions between activities:
Remember that each datapoint comes with a timestamp, so the length of each activity can be extracted by looking at the timestamp differences.
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