Fix inverted mmap inside webdataset reader, cleans copy_read_data_

[JanuszL]

• fix the wrong ussage of mmap when the user is not asking for it inside webdataset
• cleans up usage of copy_read_data_

Category:

Bug fix (non-breaking change which fixes an issue)

Description:

• fix the wrong ussage of mmap when the user is not asking for it inside webdataset
• cleans up usage of copy_read_data_

Additional information:

Affected modules and functionalities:

• webdataset reader
• loaders

Key points relevant for the review:

• logic

Tests:

• [x] Existing tests apply
  • python/reader tests
• [ ] New tests added
  • [ ] Python tests
  • [ ] GTests
  • [ ] Benchmark
  • [ ] Other
• [ ] N/A

Checklist

Documentation

• [ ] Existing documentation applies
• [ ] Documentation updated
  • [ ] Docstring
  • [ ] Doxygen
  • [ ] RST
  • [ ] Jupyter
  • [ ] Other
• [x] N/A

DALI team only

Requirements

• [ ] Implements new requirements
• [ ] Affects existing requirements
• [x] N/A

REQ IDs: N/A

JIRA TASK: N/A

[JanuszL]

!build

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CI MESSAGE: [19486724]: BUILD STARTED

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[JanuszL]

!build

[dali-automaton]

CI MESSAGE: [19618233]: BUILD STARTED

[dali-automaton]

CI MESSAGE: [19618233]: BUILD PASSED