[Feature] Complete Evaluation and README of Guided-Diffusion

[plyfager]

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Motivation

Complete Evaluation and README of Guided-Diffusion.

Modification

• Release Evaluation Results.
• Add classifier-guided sampling.

Who can help? @ them here!

BC-breaking (Optional)

Does the modification introduce changes that break the backward-compatibility of the downstream repositories?
If so, please describe how it breaks the compatibility and how the downstream projects should modify their code to keep compatibility with this PR.

Use cases (Optional)

If this PR introduces a new feature, it is better to list some use cases here, and update the documentation.

Checklist

Before PR:

• I have read and followed the workflow indicated in the CONTRIBUTING.md to create this PR.
• Pre-commit or linting tools indicated in CONTRIBUTING.md are used to fix the potential lint issues.
• Bug fixes are covered by unit tests, the case that causes the bug should be added in the unit tests.
• New functionalities are covered by complete unit tests. If not, please add more unit test to ensure the correctness.
• The documentation has been modified accordingly, including docstring or example tutorials.

After PR:

• If the modification has potential influence on downstream or other related projects, this PR should be tested with some of those projects.
• CLA has been signed and all committers have signed the CLA in this PR.

[codecov]

Codecov Report

Base: 88.98% // Head: 88.22% // Decreases project coverage by -0.76% ⚠️

Coverage data is based on head (e183c14) compared to base (46ae779).
Patch coverage: 16.83% of modified lines in pull request are covered.

❗ Current head e183c14 differs from pull request most recent head 76621cc. Consider uploading reports for the commit 76621cc to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           dev-1.x    #1547      +/-   ##
===========================================
- Coverage    88.98%   88.22%   -0.76%     
===========================================
  Files          400      401       +1     
  Lines        26101    26380     +279     
  Branches      4044     4082      +38     
===========================================
+ Hits         23225    23275      +50     
- Misses        1975     2203     +228     
- Partials       901      902       +1     

Flag	Coverage Δ
unittests	88.22% <16.83%> (-0.76%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
mmedit/evaluation/metrics/fid.py	83.17% <ø> (ø)
mmedit/models/editors/ddim/ddim_scheduler.py	80.85% <0.00%> (-4.55%)	⬇️
mmedit/models/editors/guided_diffusion/adm.py	21.48% <9.09%> (+0.51%)	⬆️
mmedit/models/editors/ddpm/ddpm_scheduler.py	75.51% <12.50%> (-5.61%)	⬇️
...edit/models/editors/guided_diffusion/classifier.py	17.06% <17.06%> (ø)
mmedit/evaluation/metrics/base_gen_metric.py	88.88% <100.00%> (+0.17%)	⬆️
mmedit/models/editors/guided_diffusion/__init__.py	100.00% <100.00%> (ø)

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