{ "backend": "webgpu_mldrift", "entries": [ { "constraints": { "dynamic_shape": false, "rank": 2 }, "dtypes": [ "float32" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:ABS__float32__eb9e96e4" }, "op": "ABS", "provenance": "measured", "status": "delegated" }, { "constraints": { "dynamic_shape": false, "rank": 3 }, "dtypes": [ "float32" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:ABS__float32__2f80e252" }, "op": "ABS", "provenance": "measured", "status": "delegated" }, { "constraints": { "dynamic_shape": false, "rank": 1 }, "dtypes": [ "int32" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:ABS__int32__c7a37486" }, "op": "ABS", "provenance": "measured", "status": "delegated" }, { "constraints": { "dynamic_shape": false, "rank": 1 }, "dtypes": [ "float32" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:ADD__float32__c7a37486" }, "op": "ADD", "provenance": "measured", "status": "delegated" }, { "constraints": { "dynamic_shape": false, "rank": 2 }, "dtypes": [ "float32" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:ADD__float32__eb9e96e4" }, "op": "ADD", "provenance": "measured", "status": "delegated" }, { "constraints": { "dynamic_shape": false, "rank": 3 }, "dtypes": [ "float32" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:ADD__float32__2f80e252" }, "op": "ADD", "provenance": "measured", "status": "delegated" }, { "constraints": { "dynamic_shape": false, "rank": 4 }, "dtypes": [ "float32" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:ADD__float32__c383a423" }, "op": "ADD", "provenance": "measured", "status": "delegated" }, { "constraints": { "dynamic_shape": false, "rank": 1 }, "dtypes": [ "int32" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:ADD__int32__c7a37486" }, "op": "ADD", "provenance": "measured", "status": "delegated" }, { "conditions": "delegate error: 'ARG_MAX: Tensor type(INT64) is not supported.' torch argmax always yields int64, and a rank-0 result drags CAST/RESHAPE/SELECT/CONCATENATION into int64 with it (in-graph greedy sampling idiom).", "dtypes": [ "int64" ], "evidence": { "date": "2026-08-13", "litert_version": "2.5.3", "source_model": "probe:argmax-onehot-construct" }, "op": "ARG_MAX", "provenance": "measured", "rewrite_hints": [ { "expected_effect": "ARG_MAX/CAST/CONCATENATION int64 refusals and GATHER_ND all gone; probe rewrite fully delegated, bit-exact vs stock chain", "rewrite": "reduce-max + arithmetic selector, int64-free: m = max(logits, keepdim); onehot = (logits >= m).float(); code = (onehot @ arange).int32; embedding row = onehot @ table (ties are measure-zero when noise is added pre-argmax)", "symptom": "in-graph argmax sampling (argmax -> cast -> index_select) strands an int64 op chain on CPU, x heads/steps in folded MTP graphs" } ], "status": "fallback" }, { "constraints": { "dynamic_shape": false, "rank": 4 }, "dtypes": [ "float32" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:AVERAGE_POOL_2D__float32__c383a423" }, "op": "AVERAGE_POOL_2D", "provenance": "measured", "status": "delegated" }, { "constraints": { "dynamic_shape": false, "rank": 2 }, "dtypes": [ "float32" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:BATCH_MATMUL__float32__eb9e96e4" }, "op": "BATCH_MATMUL", "provenance": "measured", "status": "delegated" }, { "constraints": { "dynamic_shape": false, "rank": 3 }, "dtypes": [ "float32" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:BATCH_MATMUL__float32__2f80e252" }, "op": "BATCH_MATMUL", "provenance": "measured", "status": "delegated" }, { "constraints": { "dynamic_shape": false, "rank": 4 }, "dtypes": [ "float32" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:BATCH_MATMUL__float32__c383a423" }, "op": "BATCH_MATMUL", "provenance": "measured", "status": "delegated" }, { "conditions": "delegate error: 'BROADCAST_TO: Operation is not supported.' (flat, any rank observed). Emitted by torch expand / repeat_interleave — most commonly transformers' GQA repeat_kv (sdpa_attention.py) in models exported straight from HF modeling.", "dtypes": [ "float32" ], "evidence": { "date": "2026-08-13", "litert_version": "2.5.3", "source_model": "lfm25-encoder-230m_wi8fc (sweep 2026-08-13) + rank-4 re-export A/B" }, "op": "BROADCAST_TO", "provenance": "measured", "rewrite_hints": [ { "expected_effect": "BROADCAST_TO disappears from the graph; LFM2.5-Encoder-230M went 136/828 partial -> full delegation (Metal and single-signature webgpu, 55x vs wasm)", "rewrite": "express the replication as an outer product with a ones row via matmul (or let the converter fold it to a broadcast MUL): x.reshape(b*h, s*d, 1) @ ones(1, n_rep) -> transpose -> reshape(b, h*n_rep, s, d); bitwise-identical to expand", "symptom": "expand/repeat_interleave lowers to BROADCAST_TO; delegate refuses it outright, stranding the attention block on CPU" } ], "status": "fallback" }, { "constraints": { "dynamic_shape": false, "rank": 2 }, "dtypes": [ "bool" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:CAST__bool__eb9e96e4" }, "op": "CAST", "provenance": "measured", "status": "fallback" }, { "constraints": { "dynamic_shape": false, "rank": 1 }, "dtypes": [ "float32" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:CAST__float32__c7a37486" }, "op": "CAST", "provenance": "measured", "status": "delegated" }, { "constraints": { "dynamic_shape": false, "rank": 2 }, "dtypes": [ "float32" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:CAST__float32__eb9e96e4" }, "op": "CAST", "provenance": "measured", "status": "delegated" }, { "constraints": { "dynamic_shape": false, "rank": 3 }, "dtypes": [ "float32" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:CAST__float32__2f80e252" }, "op": "CAST", "provenance": "measured", "status": "delegated" }, { "constraints": { "dynamic_shape": false, "rank": 1 }, "dtypes": [ "int32" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:CAST__int32__c7a37486" }, "op": "CAST", "provenance": "measured", "status": "delegated" }, { "constraints": { "dynamic_shape": false, "rank": 2 }, "dtypes": [ "int32" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:CAST__int32__eb9e96e4" }, "op": "CAST", "provenance": "measured", "status": "delegated" }, { "constraints": { "dynamic_shape": false, "rank": 2 }, "dtypes": [ "int64" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:CAST__int64__eb9e96e4" }, "op": "CAST", "provenance": "measured", "rewrite_hints": [ { "expected_effect": "int64 CAST removed from the graph (advisory guidance; no executable rule)", "rewrite": "avoid int64 in the exported graph: compute valid-lengths/positions in int32 or float32 before export, or host-side; interior CAST[int64] cannot be removed by io_cast and chain retype is outside the v1 rule vocabulary", "symptom": "int64 CAST in the exported graph (typically a valid-length or position computation)" } ], "status": "fallback" }, { "constraints": { "dynamic_shape": false, "rank": 1 }, "dtypes": [ "float32" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:CONCATENATION__float32__c7a37486" }, "op": "CONCATENATION", "provenance": "measured", "status": "delegated" }, { "constraints": { "dynamic_shape": false, "rank": 2 }, "dtypes": [ "float32" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:CONCATENATION__float32__eb9e96e4" }, "op": "CONCATENATION", "provenance": "measured", "status": "delegated" }, { "constraints": { "dynamic_shape": false, "rank": 3 }, "dtypes": [ "float32" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:CONCATENATION__float32__2f80e252" }, "op": "CONCATENATION", "provenance": "measured", "status": "delegated" }, { "constraints": { "dynamic_shape": false, "rank": 4 }, "dtypes": [ "float32" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:CONCATENATION__float32__c383a423" }, "op": "CONCATENATION", "provenance": "measured", "status": "delegated" }, { "constraints": { "dynamic_shape": false, "rank": 4 }, "dtypes": [ "float32" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:CONV_2D__float32__c383a423" }, "op": "CONV_2D", "provenance": "measured", "status": "delegated" }, { "constraints": { "dynamic_shape": false, "rank": 2 }, "dtypes": [ "float32" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:COS__float32__eb9e96e4" }, "op": "COS", "provenance": "measured", "status": "delegated" }, { "constraints": { "dynamic_shape": false, "rank": 3 }, "dtypes": [ "float32" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:COS__float32__2f80e252" }, "op": "COS", "provenance": "measured", "status": "delegated" }, { "constraints": { "dynamic_shape": false, "rank": 4 }, "dtypes": [ "float32" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:DEPTHWISE_CONV_2D__float32__c383a423" }, "op": "DEPTHWISE_CONV_2D", "provenance": "measured", "status": "delegated" }, { "constraints": { "dynamic_shape": false, "rank": 2 }, "dtypes": [ "float32" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:DIV__float32__eb9e96e4" }, "op": "DIV", "provenance": "measured", "status": "delegated" }, { "constraints": { "dynamic_shape": false, "rank": 3 }, "dtypes": [ "float32" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:DIV__float32__2f80e252" }, "op": "DIV", "provenance": "measured", "status": "delegated" }, { "constraints": { "dynamic_shape": false, "rank": 4 }, "dtypes": [ "float32" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:DIV__float32__c383a423" }, "op": "DIV", "provenance": "measured", "status": "delegated" }, { "constraints": { "dynamic_shape": false, "rank": 2 }, "dtypes": [ "float32" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:EMBEDDING_LOOKUP__float32__eb9e96e4" }, "op": "EMBEDDING_LOOKUP", "provenance": "measured", "status": "delegated" }, { "constraints": { "dynamic_shape": false, "rank": 1 }, "dtypes": [ "bool" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:EQUAL__bool__c7a37486" }, "op": "EQUAL", "provenance": "measured", "status": "fallback" }, { "constraints": { "dynamic_shape": false, "rank": 2 }, "dtypes": [ "bool" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:EQUAL__bool__eb9e96e4" }, "op": "EQUAL", "provenance": "measured", "status": "fallback" }, { "constraints": { "dynamic_shape": false, "rank": 3 }, "dtypes": [ "bool" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:EQUAL__bool__2f80e252" }, "op": "EQUAL", "provenance": "measured", "status": "fallback" }, { "constraints": { "dynamic_shape": false, "rank": 2 }, "dtypes": [ "float32" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:EXP__float32__eb9e96e4" }, "op": "EXP", "provenance": "measured", "status": "delegated" }, { "constraints": { "dynamic_shape": false, "rank": 3 }, "dtypes": [ "float32" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:EXP__float32__2f80e252" }, "op": "EXP", "provenance": "measured", "status": "delegated" }, { "constraints": { "dynamic_shape": false, "rank": 4 }, "dtypes": [ "float32" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:EXP__float32__c383a423" }, "op": "EXP", "provenance": "measured", "status": "delegated" }, { "constraints": { "dynamic_shape": false, "rank": 3 }, "dtypes": [ "float32" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:FLOOR_MOD__float32__2f80e252" }, "op": "FLOOR_MOD", "provenance": "measured", "status": "delegated" }, { "constraints": { "dynamic_shape": false, "rank": 2 }, "dtypes": [ "float32" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:FULLY_CONNECTED__float32__eb9e96e4" }, "op": "FULLY_CONNECTED", "provenance": "measured", "status": "delegated" }, { "constraints": { "dynamic_shape": false, "rank": 3 }, "dtypes": [ "float32" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:FULLY_CONNECTED__float32__2f80e252" }, "op": "FULLY_CONNECTED", "provenance": "measured", "status": "delegated" }, { "constraints": { "dynamic_shape": false, "rank": 4 }, "dtypes": [ "float32" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:FULLY_CONNECTED__float32__c383a423" }, "op": "FULLY_CONNECTED", "provenance": "measured", "status": "delegated" }, { "conditions": "delegate error: 'GATHER_ND: Operation is not supported.' Two common producers measured: F.pad(mode='reflect') (mirror-index arithmetic + gather) and index_select/embedding-row lookup driven by an in-graph computed index.", "dtypes": [ "float32" ], "evidence": { "date": "2026-08-13", "litert_version": "2.5.3", "source_model": "probe:reflect-pad-construct-3way" }, "op": "GATHER_ND", "provenance": "measured", "rewrite_hints": [ { "expected_effect": "GATHER_ND/STABLEHLO_PAD gone; 3-way construct probe: only the F.pad spelling refused, both rewrites delegated, outputs match at 6e-08", "rewrite": "spell reflect pad as slice + flip + concat (flip lowers to REVERSE_V2, accepted) or slice + constant reversal-matrix matmul + concat; both bitwise-identical to F.pad reflect", "symptom": "reflect padding lowers to GATHER_ND (and/or STABLEHLO_PAD); audio codec / vocoder graphs lose the pad+conv chain to CPU" }, { "expected_effect": "GATHER_ND and the int64 index chain gone; construct probe bit-exact (max_abs 0) with the rewrite fully delegated", "rewrite": "one-hot matmul: onehot = (logits >= reduce_max(logits)) cast to float; row = onehot @ table; code = onehot @ arange as int32", "symptom": "table row lookup by a computed code (index_select after argmax) lowers to GATHER_ND" } ], "status": "fallback" }, { "constraints": { "dynamic_shape": false, "rank": 3 }, "dtypes": [ "bool" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:GREATER__bool__2f80e252" }, "op": "GREATER", "provenance": "measured", "status": "fallback" }, { "constraints": { "dynamic_shape": false, "rank": 4 }, "dtypes": [ "bool" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:GREATER__bool__c383a423" }, "op": "GREATER", "provenance": "measured", "status": "fallback" }, { "constraints": { "dynamic_shape": false, "rank": 2 }, "dtypes": [ "float32" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:HARD_SWISH__float32__eb9e96e4" }, "op": "HARD_SWISH", "provenance": "measured", "status": "delegated" }, { "constraints": { "dynamic_shape": false, "rank": 4 }, "dtypes": [ "float32" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:HARD_SWISH__float32__c383a423" }, "op": "HARD_SWISH", "provenance": "measured", "status": "delegated" }, { "constraints": { "dynamic_shape": false, "rank": 3 }, "dtypes": [ "float32" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:LEAKY_RELU__float32__2f80e252" }, "op": "LEAKY_RELU", "provenance": "measured", "status": "delegated" }, { "constraints": { "dynamic_shape": false, "rank": 4 }, "dtypes": [ "float32" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:LEAKY_RELU__float32__c383a423" }, "op": "LEAKY_RELU", "provenance": "measured", "status": "delegated" }, { "constraints": { "dynamic_shape": false, "rank": 2 }, "dtypes": [ "float32" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:LOG__float32__eb9e96e4" }, "op": "LOG", "provenance": "measured", "status": "delegated" }, { "constraints": { "dynamic_shape": false, "rank": 3 }, "dtypes": [ "float32" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:LOG__float32__2f80e252" }, "op": "LOG", "provenance": "measured", "status": "delegated" }, { "constraints": { "dynamic_shape": false, "rank": 4 }, "dtypes": [ "float32" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:LOG__float32__c383a423" }, "op": "LOG", "provenance": "measured", "status": "delegated" }, { "constraints": { "dynamic_shape": false, "rank": 2 }, "dtypes": [ "float32" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:LOGISTIC__float32__eb9e96e4" }, "op": "LOGISTIC", "provenance": "measured", "status": "delegated" }, { "constraints": { "dynamic_shape": false, "rank": 3 }, "dtypes": [ "float32" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:LOGISTIC__float32__2f80e252" }, "op": "LOGISTIC", "provenance": "measured", "status": "delegated" }, { "constraints": { "dynamic_shape": false, "rank": 4 }, "dtypes": [ "float32" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:LOGISTIC__float32__c383a423" }, "op": "LOGISTIC", "provenance": "measured", "status": "delegated" }, { "constraints": { "dynamic_shape": false, "rank": 2 }, "dtypes": [ "float32" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:MAXIMUM__float32__eb9e96e4" }, "op": "MAXIMUM", "provenance": "measured", "status": "delegated" }, { "constraints": { "dynamic_shape": false, "rank": 3 }, "dtypes": [ "float32" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:MAXIMUM__float32__2f80e252" }, "op": "MAXIMUM", "provenance": "measured", "status": "delegated" }, { "constraints": { "dynamic_shape": false, "rank": 4 }, "dtypes": [ "float32" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:MAXIMUM__float32__c383a423" }, "op": "MAXIMUM", "provenance": "measured", "status": "delegated" }, { "constraints": { "dynamic_shape": false, "rank": 4 }, "dtypes": [ "float32" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:MAX_POOL_2D__float32__c383a423" }, "op": "MAX_POOL_2D", "provenance": "measured", "status": "delegated" }, { "constraints": { "dynamic_shape": false, "rank": 1 }, "dtypes": [ "float32" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:MEAN__float32__c7a37486" }, "op": "MEAN", "provenance": "measured", "status": "delegated" }, { "constraints": { "dynamic_shape": false, "rank": 2 }, "dtypes": [ "float32" ], "evidence": { "date": "2026-08-12", "litert_version": "2.5.3", "source_model": "probe:MEAN__float32__eb9e96e4" }, "op": 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