SGD: add Robbins–Monro context and bounded-variance assumption #2660
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Description of changes:
What: Adds a short “Historical context & common assumptions” box to §12.4 (SGD),
covering Robbins–Monro step-size conditions and the bounded-variance assumption.
Adds two references to
d2l.bib(Robbins–Monro 1951; Bottou–Curtis–Nocedal 2018).Why: Connects the unbiased SGD update to classical stochastic approximation and
clarifies standard assumptions used in modern analyses.
Notes: Text-only change. Built locally with
eval_notebook = False.By submitting this pull request, I confirm that you can use, modify,
copy, and redistribute this contribution, under the terms of your
choice.