fix: modify the shape for graph mode of informer #47

[LongxingTan]

Description

This PR ...

Checklist

• Linked issues (if existing)
• Amended changelog.md for large changes (and added myself there as contributor)
• Added/modified tests
• Used pre-commit hooks when committing to ensure that code is compliant with hooks. Install hooks with pre-commit install.
  To run hooks independent of commit, execute pre-commit run --all-files

Thank you for joining. Have fun coding!

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (4b179e8) 88.97% compared to head (c3b2e11) 89.07%.

❗ Current head c3b2e11 differs from pull request most recent head 12116e1. Consider uploading reports for the commit 12116e1 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #49      +/-   ##
==========================================
+ Coverage   88.97%   89.07%   +0.09%     
==========================================
  Files          27       27              
  Lines        2132     2133       +1     
==========================================
+ Hits         1897     1900       +3     
+ Misses        235      233       -2     

Flag	Coverage Δ
cpu	89.07% <100.00%> (+0.09%)	⬆️
unittest	89.07% <100.00%> (+0.09%)	⬆️

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Files	Coverage Δ
tfts/layers/attention_layer.py	90.00% <100.00%> (+0.06%)	⬆️
tfts/layers/mask_layer.py	100.00% <100.00%> (ø)
tfts/models/informer.py	91.41% <ø> (+1.22%)	⬆️

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