Add pass to remove unused parameters in to_executorch #10484
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GregoryComer
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tarun292 and
larryliu0820
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This pull request was exported from Phabricator. Differential Revision: D73654202 |
GregoryComer
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module: exir
Summary: Currently, ExecuTorch will serialize any parameters in the exported program, regardless of whether they are actually used. Exporting with strict=True will remove unused parameters, but strict=False will not. Export recently switched to non-strict as the default behavior. This causes PTE bloat when doing pt2e quantization (unquantized weights are left in the graph) or sometimes when exporting multiple methods (encode and decoder, for example). This PR adds a new pass (`remove_unused_parameters_pass`) to strip unused parameters from the `ExportedProgram`. It is run as part of `to_executorch`. Parameters are considered unused if there are no uses of the placeholder node. Parameters are removed by stripping them from the state_dict, input specs, and graph. As a question for reviewers, should we run this pass earlier, as part of to_edge? My rationale for running as part of to_executorch was that it could theoretically clean up anything else left by partitioning and lowering, but I'm not aware of any concrete use cases for this. Differential Revision: D73654202
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Can we run it in to_edge instead? We should remove unused things as soon as possible imo. |
Sure, I'll move it to there. |
JacobSzwejbka
approved these changes
Apr 28, 2025
| ) -> bool: | ||
| placeholder_node = placeholder_nodes.get(parameter) | ||
| if placeholder_node is None: | ||
| # Shouldn't happen, but in this case, leave the parameter to be safe. |
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Summary:
Currently, ExecuTorch will serialize any parameters in the exported program, regardless of whether they are actually used. Exporting with strict=True will remove unused parameters, but strict=False will not. Export recently switched to non-strict as the default behavior.
This causes PTE bloat when doing pt2e quantization (unquantized weights are left in the graph) or sometimes when exporting multiple methods (encode and decoder, for example).
This PR adds a new pass (
remove_unused_parameters_pass) to strip unused parameters from theExportedProgram. It is run as part ofto_executorch. Parameters are considered unused if there are no uses of the placeholder node. Parameters are removed by stripping them from the state_dict, input specs, and graph.As a question for reviewers, should we run this pass earlier, as part of to_edge? My rationale for running as part of to_executorch was that it could theoretically clean up anything else left by partitioning and lowering, but I'm not aware of any concrete use cases for this.
Differential Revision: D73654202
cc @JacobSzwejbka @angelayi