Core concept
Managed training on p/g instances. Spot training. Distributed (SMDDP). Automatic model tuning (Bayesian).
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How it works
Complex platform. Steep learning curve. Cost adds up. Simpler alternatives (Vertex AI, Databricks) for smaller teams.
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Trade-offs + gotchas
Enterprise ML teams. AWS-centric ML pipelines. When needing tight integration with S3/Athena/Glue.