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devices.qubit.measure uses csr_dot_products only when it is usable. #6278

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merged 19 commits into from
Sep 19, 2024

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astralcai
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@astralcai astralcai commented Sep 17, 2024

There are a couple of scenarios when csr_dot_products is not usable for Sum and Hamiltonians:

  1. When not all of the ops has a sparse matrix
  2. When it's a legacy Hamiltonian and one of the ops are multi-wired.

Fixes #6264

[sc-73590]
[sc-73868]

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codecov bot commented Sep 17, 2024

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.69%. Comparing base (cbc5a9d) to head (da9e3c1).
Report is 2 commits behind head on master.

Additional details and impacted files
@@            Coverage Diff             @@
##           master    #6278      +/-   ##
==========================================
- Coverage   99.69%   99.69%   -0.01%     
==========================================
  Files         443      444       +1     
  Lines       42022    42133     +111     
==========================================
+ Hits        41894    42004     +110     
- Misses        128      129       +1     

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Since a new property is added to Operator, we should probably also add tests for it

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This looks good! I just have a couple of questions. Is this PR relevant for this bug?

pennylane/devices/qubit/measure.py Show resolved Hide resolved
tests/devices/qubit/test_measure.py Outdated Show resolved Hide resolved
astralcai and others added 2 commits September 19, 2024 15:27
Co-authored-by: Pietropaolo Frisoni <pietropaolo.frisoni@xanadu.ai>
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This looks good! I just have a couple of questions. Is this PR relevant for this bug?

Yes, Fixes #6264

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LGTM

@astralcai astralcai enabled auto-merge (squash) September 19, 2024 19:31
@astralcai astralcai merged commit 4ae7113 into master Sep 19, 2024
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@astralcai astralcai deleted the fix-measure branch September 19, 2024 20:23
mudit2812 pushed a commit that referenced this pull request Sep 23, 2024
…e. (#6278)

There are a couple of scenarios when `csr_dot_products` is not usable
for `Sum` and `Hamiltonians`:
1. When not all of the ops has a sparse matrix
2. When it's a legacy Hamiltonian and one of the ops are multi-wired.

Fixes #6264

[sc-73590]
[sc-73868]

---------

Co-authored-by: Pietropaolo Frisoni <pietropaolo.frisoni@xanadu.ai>
astralcai added a commit that referenced this pull request Sep 30, 2024
A follow up PR to #6278,
fixes recent failure in legacy opmath.
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[BUG] measure assumes all LinearCombination objects provide a sparse matrix
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