[dionhaefner]

Relevant issue or PR

Stacked on #73, since it needs tesseract-core 1.15, which #73 requires. Merge after #73.

Description of changes

A differentiable leaf inside a dict[str, Differentiable[...]] field is named params.{key} in gradient requests. tesseract-core 1.15 requires {, } and \ in the key to be backslash-escaped there. tesseract-torch sent such keys unescaped, so their backward pass failed with a validation error:

out = apply_tesseract(tess, {"params": {"a{b": x}})
out["y"].sum().backward()  # raised a ValidationError, now computes x.grad

Keys without these characters are sent as before. A key spelled {} used to be mistaken for the template itself; it is now escaped like any other concrete key.

Testing done

• New unit tests for the escaped wire names, and the existing end-to-end gradient test for dict keys now also covers a{b, a}b, {} and a\b.
• Locally against tesseract-core 1.15.0, these tests pass with the fix and the four new keys fail without it.

[PasteurBot]

Benchmark Results

Benchmarks measure tesseract-torch execution time using noop and vectoradd Tesseracts.

🚀 0 faster, ⚠️ 0 slower, ✅ 16 unchanged

✅ No significant performance changes detected.

Full results

Benchmark	Baseline	Current	Change	Status
noop_api/apply_1,000	0.789ms	0.796ms	+0.9%	✅
noop_api/apply_100,000	0.813ms	0.821ms	+1.0%	✅
noop_api/apply_1,000,000	0.921ms	0.961ms	+4.4%	✅
noop_api/apply_10,000,000	5.893ms	5.917ms	+0.4%	✅
noop_api/cast_float64_1,000	0.803ms	0.817ms	+1.7%	✅
noop_api/cast_float64_100,000	0.855ms	0.866ms	+1.3%	✅
noop_api/cast_float64_1,000,000	1.152ms	1.205ms	+4.6%	✅
noop_api/cast_float64_10,000,000	13.680ms	13.615ms	-0.5%	✅
vectoradd_api/apply_1,000	0.839ms	0.848ms	+1.1%	✅
vectoradd_api/apply_100,000	0.879ms	0.891ms	+1.3%	✅
vectoradd_api/apply_1,000,000	1.156ms	1.164ms	+0.7%	✅
vectoradd_api/apply_10,000,000	12.739ms	12.838ms	+0.8%	✅
vectoradd_api/backward_1,000	1.775ms	1.778ms	+0.2%	✅
vectoradd_api/backward_100,000	1.976ms	1.970ms	-0.3%	✅
vectoradd_api/backward_1,000,000	3.120ms	3.208ms	+2.8%	✅
vectoradd_api/backward_10,000,000	29.049ms	31.892ms	+9.8%	✅

• PR: fix: support {, } and \ in dict keys of differentiable fields #78
• Runner: Linux 7.0.0-1017-azure x86_64

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.30%. Comparing base (176e85b) to head (24972f1).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #78      +/-   ##
==========================================
+ Coverage   90.05%   90.30%   +0.24%     
==========================================
  Files           2        2              
  Lines         362      361       -1     
  Branches       67       66       -1     
==========================================
  Hits          326      326              
  Misses         12       12              
+ Partials       24       23       -1     

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