metrik-explorer

Architecture, parameter, and memory analysis — without a forward pass, without torch, and without a GPU.

$ metrik explore ./models/TinyLlama-1.1B

Reads safetensors headers (a length-prefixed JSON blob) and config.json. No tensor is ever deserialized, no torch is imported, and no forward pass happens.

One honest caveat: ModelFingerprint.weight_digest is a merkle over the weight files, because identity has to be content-based — a benchmark result attached to a name rather than a digest is unfalsifiable (artifacts.md §6.1). So the command does stream every weight byte through BLAKE3 once. It is I/O-bound, not compute-bound, and nothing is held in memory, but it is not free on a 140 GB directory. Header parsing alone is free, and that is what the structural analysis uses.

Emits four artifacts:

Artifact What it carries
ModelFingerprint identity: merkle over weight files, config digest, param split
ModelGraph one node per tensor — no edges, declared as an omission
GraphSummary role/dtype/depth breakdown plus evidenced observations
MemoryEstimate analytic weights + KV cache, with stated assumptions

What it deliberately does not do

  • No ParamStats. Per-tensor statistics need the weight data and a blob format that is still an open question (artifacts.md §8, question 1).
  • No graph edges. Headers describe storage, not dataflow. A topology needs torch and a forward pass, which is a different loader behind the same contract.
  • No measured numbers. MemoryEstimate is analytic by type and can never contain one (artifacts.md §5).

Role classification is name-based pattern matching, so GraphSummary.classification_confidence always reports what fraction of parameters it could not classify. A confident breakdown of a model the heuristic did not understand is worse than no breakdown.

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  • Released:
Newer release available (0.3.1)

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Credits

Author: The Metrik Authors

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License expression

Apache-2.0
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Requires

Python >=3.11

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