Minor: redundant get_raw_statistic_collector backend methods are removed

[daniil-lyakhov]

Made by Claude Opus 4.6

Changes

Remove the redundant raw_statistic_collector abstract method from
algorithm backends

[Copilot]

Pull request overview

This PR removes redundant backend-specific raw_statistic_collector methods and switches call sites to use the shared get_raw_stat_collector builder directly, simplifying backend interfaces for bias correction and layerwise engines.

Changes:

• Removed raw_statistic_collector abstract methods from bias-correction and layerwise backend base classes.
• Deleted corresponding backend implementations (ONNX/OpenVINO/Torch FX bias correction backends; OpenVINO layerwise backend).
• Updated bias-correction and layerwise engine code (and a related test) to use nncf.common.tensor_statistics.builders.get_raw_stat_collector.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tests/common/test_statistics_aggregator.py	Updates the RAW collector test path to use get_raw_stat_collector directly.
src/nncf/quantization/algorithms/layerwise/openvino_backend.py	Removes redundant raw-stat collector method and now-unneeded imports.
src/nncf/quantization/algorithms/layerwise/engine.py	Uses get_raw_stat_collector directly instead of backend method.
src/nncf/quantization/algorithms/layerwise/backend.py	Drops the raw-stat collector abstract method from the backend interface.
src/nncf/quantization/algorithms/bias_correction/torch_fx_backend.py	Removes redundant raw-stat collector method and its import.
src/nncf/quantization/algorithms/bias_correction/openvino_backend.py	Removes redundant raw-stat collector method and its import.
src/nncf/quantization/algorithms/bias_correction/onnx_backend.py	Removes redundant raw-stat collector method and its import.
src/nncf/quantization/algorithms/bias_correction/backend.py	Drops the raw-stat collector abstract method from the backend interface.
src/nncf/quantization/algorithms/bias_correction/algorithm.py	Uses get_raw_stat_collector directly instead of backend method.

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