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Feature Request: Add custom data module support to TorchEstimator

Feature Request: Add custom data module support to TorchEstimator: a task in LegoFlow-SWE (Harbor dataset). Problem TorchEstimator currently hardcodes its data loading to use only Petastorm-based readers. This prevents users from supplying alternative data loading strategies, such as…

The task

**Problem** `TorchEstimator` currently hardcodes its data loading to use only Petastorm-based readers. This prevents users from supplying alternative data loading strategies, such as GPU-accelerated loading via NVTabular, which is already supported in the `KerasEstimator` through a `data_module` parameter. We need…

Part of Lego-X/LegoFlow-SWE.