Changelog

Features:

Allow passing pipeline configs as JSON files to the rastervision run CLI cmd (#2136)
- (as an alternative to the traditional method of passing a .py file with a get_config() function)

Fixes:

Add rastervision_aws_sagemaker to API reference on RTD (#2117)
Let RasterSource.get_chip_by_map_window() take all RasterSource.get_chip() args (#2136)
Make repr more concise for some configs (#2136)
Misc config serialization fixes and improvements (#2136)
Avoid double-wrapping model in DistributedDataParallel (#2136)
Make S3FileSystem.list_paths() only list direct children (#2136)
Add missing RequestPayer arg to some s3-related boto3 API calls (#2136)
Fix incorrect path in RV pipeline examples doc (#2138)

Maintenance:

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