The MIL scalar types used shorthand syntax (string("x"), int32(1)) that
only works on M4. Changed to the canonical verbose format that CoreML's
own compiler emits (tensor<string, []>("x"), tensor<int32, []>(1)).
Also targets program(1.0) with <ios16> instead of program(1.3)/<ios18>,
and simplifies buildInfo to just coremlc-version.
For conv-based kernels, adds runtime fp16 I/O fallback — M1/M2 ANE
doesn't support the cast op (fp32<->fp16), so on first compile failure
it retries with native fp16 inputs/outputs and does the conversion on
the CPU side. The fallback is persisted across exec() restarts.
Note: matmul and scaled_dot_product_attention ops still fail on M1/M2 —
these are M4+ ANE ops. The attention tests (test_ane_causal_attn,
test_ane_sdpa5, test_full_fused attention part) require M4 hardware.
Conv-based kernels (training, QKV projections, FFN) work on all generations.
Tested on M1 Pro, macOS 26.3 (Tahoe).
Key findings from running all 4 probes on Apple M5:
- Weight reload (unload+load after file overwrite) does NOT work — weights
are baked at compile time, output is identical regardless of file changes
- weightsBuffer IOSurface parameter also does not override compiled weights
- All QoS values 0-63 work, no measurable latency difference (~0.07ms/eval)
- _ANEPerformanceStats has hwExecutionTime (ns) + perfCounterData
- _ANEChainingRequest supports loopback execution (output→input chaining)
- _ANEClient has real-time eval path and chaining preparation methods
- procedureIndex 0-15 all succeed on single-procedure models
Fixed probe tests to use fp32 I/O with cast (matching inmem_peak pattern)
and 64+ channel kernels (ANE minimum size requirement).
Full analysis in training/m5result.md.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Four standalone probe tests to characterize the M5 ANE:
- test_weight_reload: Can weights be hot-swapped via unload+load without recompilation?
- test_perf_stats: Enumerate _ANEPerformanceStats methods/properties and hardware counters
- test_qos_sweep: Measure compile/load/eval latency across QoS 0-63
- test_ane_advanced: Probe SharedEvents, weightsBuffer IOSurface, procedureIndex, VirtualClient
Training telemetry (train_large.m):
- JSON lines to stderr with per-step timing breakdown and per-batch TFLOPS metrics
- Enables external monitoring tools to visualize ANE utilization in real-time
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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