As seen in:
http://stanford.edu/~cpiech/cs221/img/kmeansMath.png
Does it mean sum for all elements that satisfy the condition? What does the 1 mean? Is there a name for this notation?
2026-04-01 04:20:25.1775017225
What does the notation of $1\{a_i=b\}$ mean in a summation?
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