Update occlusion to new method of constructing ablated batches #1616
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This pull request was exported from Phabricator. Differential Revision: D76483214 |
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…ch#1616) Summary: Pull Request resolved: pytorch#1616 Differential Revision: D76483214
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…ch#1616) Summary: `FeaturePermutation` and `Occlusion` are subclasses of `FeatureAblation`, which contains the bulk of the logic around iterating through and processing perturbed inputs. Previously, `FeatureAblation` only constructed the perturbed input by looking at each input tensor individually, as there wasn't an explicit use-case that needed cross-tensor feature grouping. However this behavior has been modified to support cross-tensor masking, as different sparse features at Meta are represented by different tensors when they're finally passed to Captum, and we need to support grouping across features and feature types for various Ads workstreams/asks. The new behavior is mostly rolled out internally, and is controlled by the `enable_cross_tensor_attribution` flag. We do not want to support both behaviors indefinitely. `Occlusion` does not use the custom masks parameter exposed via `FeatureAblation`, but constructs the masks internally. There's no use-case requiring cross-tensor masking for occlusion, so it's not a requirement that it still follows the logic in `FeatureAblation`. However, it's been adapted in this diff in order to just reuse the code from `FeatureAblation`, as the logic specific to `enable_cross_tensor_attribution=False` will be going away. Differential Revision: D76483214
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Differential Revision: D76483214