fix(api): trim PyTorch type map separators

[njzjz-bot]

Problem

• PyTorch and PTExpt get_type_map implementations append a trailing space to the returned type-map string.
• Implementations that append into the output string can also retain stale caller-provided content.

Change

• Build PyTorch/DeepSpin type-map strings by joining entries with separators only between items.
• Clear output strings before filling them, including Paddle's character-buffer path.
• Tighten C/C++ tests to require exact type-map strings and cover non-empty output strings.

Authored by OpenClaw (model: custom-chat-jinzhezeng-group/gpt-5.5)

[coderabbitai]

📝 Walkthrough

Walkthrough

Five get_type_map implementations (DeepPotPT, DeepPotPTExpt, DeepSpinPT, DeepSpinPTExpt, DeepPotPD) are fixed to clear the output string before populating it and to insert spaces only between elements, removing trailing spaces. Corresponding tests are tightened from substring checks to exact-equality assertions, and new type_map typed test cases are added for the PT, PT-expt-spin, and PD fixtures.

Changes

get_type_map trailing-space fix and test coverage

Layer / File(s)	Summary
get_type_map space-join fix across backends source/api_cc/src/DeepPotPT.cc, source/api_cc/src/DeepPotPTExpt.cc, source/api_cc/src/DeepSpinPT.cc, source/api_cc/src/DeepSpinPTExpt.cc, source/api_cc/src/DeepPotPD.cc	Each implementation now clears the output string at entry and appends a space separator only when prior content already exists, eliminating the trailing-space bug present across all five variants.
Test assertions updated to exact string equality source/api_cc/tests/test_deeppot_pt.cc, source/api_cc/tests/test_deeppot_ptexpt.cc, source/api_cc/tests/test_deeppot_dpa_ptexpt_spin.cc, source/api_cc/tests/test_deeppot_pd.cc, source/api_c/tests/test_deeppot_a_ptexpt.cc	Existing type_map tests replace substring or tokenization checks with exact-equality assertions; new TYPED_TEST cases for TestInferDeepPotAPt, TestInferDeepSpinDpaPtExpt, and TestInferDeepPotAPd verify "O H", "Ni O H", and "O H" respectively; missing <string> includes are added to test files.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

Suggested reviewers

• wanghan-iapcm
• njzjz
• HydrogenSulfate

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'fix(api): trim PyTorch type map separators' directly and specifically describes the main change across multiple backend implementations - removing trailing spaces from type map strings.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[codecov]

Codecov Report

❌ Patch coverage is 82.75862% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.22%. Comparing base (d3834e2) to head (4c0d84c).

Files with missing lines	Patch %	Lines
source/api_c/tests/test_deeppot_a_ptexpt.cc	0.00%	1 Missing ⚠️
...ource/api_cc/tests/test_deeppot_dpa_ptexpt_spin.cc	75.00%	1 Missing ⚠️
source/api_cc/tests/test_deeppot_pd.cc	75.00%	1 Missing ⚠️
source/api_cc/tests/test_deeppot_pt.cc	75.00%	1 Missing ⚠️
source/api_cc/tests/test_deeppot_ptexpt.cc	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5544   +/-   ##
=======================================
  Coverage   82.21%   82.22%           
=======================================
  Files         892      892           
  Lines      101531   101542   +11     
  Branches     4240     4245    +5     
=======================================
+ Hits        83475    83490   +15     
+ Misses      16753    16751    -2     
+ Partials     1303     1301    -2     

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