[IR] Fix bug in Model str method

[justinchuby]

I mistakenly duplicated all functions many times.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.14%. Comparing base (82f8d37) to head (b7ed1a2).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1851      +/-   ##
==========================================
- Coverage   75.15%   75.14%   -0.01%     
==========================================
  Files         249      249              
  Lines       27168    27168              
  Branches     4969     4969              
==========================================
- Hits        20418    20416       -2     
- Misses       5802     5804       +2     
  Partials      948      948              

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[github-actions]

Test Results

     24 files  ±    0      24 suites  ±0   2h 44m 9s ⏱️ + 1m 7s
 15 594 tests +1 462  13 217 ✅ +1 463    2 339 💤 +1   32 ❌  - 2   6 🔥 ±0 
354 971 runs  ±    0  81 066 ✅ +    2  273 651 💤 ±0  212 ❌  - 2  42 🔥 ±0 

For more details on these failures and errors, see this check.

Results for commit b7ed1a2. ± Comparison against base commit 82f8d37.