Fix assign_output_derivative bug

[hugary1995]

The std::map::insert does not replace the value if a key already exists. This prevents IFT from updating derivatives if the variable derivative cache is not cleared after every forward evaluation.

[github-actions]

Test Results (macos-latest-Debug-ON)

    3 files      3 suites   58s ⏱️
  561 tests   561 ✅ 0 💤 0 ❌
3 377 runs  3 377 ✅ 0 💤 0 ❌

Results for commit 54dc36e.

♻️ This comment has been updated with latest results.

[github-actions]

Test Results (macos-latest-Release-ON)

    3 files      3 suites   31s ⏱️
  561 tests   561 ✅ 0 💤 0 ❌
3 375 runs  3 375 ✅ 0 💤 0 ❌

Results for commit 54dc36e.

♻️ This comment has been updated with latest results.

[github-actions]

Syntax check

No syntax error, good job! 💜

[github-actions]

Documentation preview removed.
To view the documentation, please visit the main documentation page.

[github-actions]

Test Results (ubuntu-22.04-Release-ON)

    3 files      3 suites   55s ⏱️
  561 tests   561 ✅ 0 💤 0 ❌
3 375 runs  3 375 ✅ 0 💤 0 ❌

Results for commit 54dc36e.

♻️ This comment has been updated with latest results.

[github-actions]

Python Binding Test Results (macos-latest)

85 tests   61 ✅  4s ⏱️
 1 suites  24 💤
 1 files     0 ❌

Results for commit 54dc36e.

♻️ This comment has been updated with latest results.

[github-actions]

Test Results (ubuntu-22.04-Debug-ON)

    3 files      3 suites   1m 49s ⏱️
  561 tests   561 ✅ 0 💤 0 ❌
3 377 runs  3 377 ✅ 0 💤 0 ❌

Results for commit 54dc36e.

♻️ This comment has been updated with latest results.

[github-actions]

Test Results (macos-latest-Debug-OFF)

    3 files      3 suites   58s ⏱️
  561 tests   561 ✅ 0 💤 0 ❌
3 377 runs  3 377 ✅ 0 💤 0 ❌

Results for commit 54dc36e.

♻️ This comment has been updated with latest results.

[github-actions]

Python Binding Test Results (ubuntu-22.04)

85 tests   61 ✅  7s ⏱️
 1 suites  24 💤
 1 files     0 ❌

Results for commit 54dc36e.

♻️ This comment has been updated with latest results.

[github-actions]

Test Results (macos-latest-Release-OFF)

    3 files      3 suites   33s ⏱️
  561 tests   561 ✅ 0 💤 0 ❌
3 375 runs  3 375 ✅ 0 💤 0 ❌

Results for commit 54dc36e.

♻️ This comment has been updated with latest results.

[github-actions]

Test Results (ubuntu-22.04-Release-OFF)

    3 files      3 suites   55s ⏱️
  561 tests   561 ✅ 0 💤 0 ❌
3 375 runs  3 375 ✅ 0 💤 0 ❌

Results for commit 54dc36e.

♻️ This comment has been updated with latest results.

[github-actions]

Test Results (ubuntu-22.04-Debug-OFF)

    3 files      3 suites   2m 2s ⏱️
  561 tests   561 ✅ 0 💤 0 ❌
3 377 runs  3 377 ✅ 0 💤 0 ❌

Results for commit 54dc36e.

♻️ This comment has been updated with latest results.

[hugary1995]

close in favor of #187 which is based on this