remove(submodule=pennylane): Removing pennylane

The benchmarking using pennylane
- is rarely used;
- seems to be flaky on the CI;
- there's an extra complexity to manage it;
- any benchmarking using pennylane should be done in the
  pennylane-piquasso plugin.

For these reasons, the pennylane submodule with the benchmark got
deleted.

.gitlab-ci.yml

@@ -8,8 +8,6 @@ stages:
   - build
 
 unittest:
-  variables:
-    GIT_SUBMODULE_STRATEGY: none
   rules:
     - if: '$CI_PIPELINE_SOURCE == "merge_request_event" || $CI_PIPELINE_SOURCE == "push"'
   stage: test
@@ -22,30 +20,18 @@ unittest:
     expire_in: 15 days
 
 benchmark:
-  variables:
-    GIT_SUBMODULE_STRATEGY: normal #to use submodule
   rules:
     - if: '$CI_PIPELINE_SOURCE == "merge_request_event" || $CI_PIPELINE_SOURCE == "push"'
   stage: test
   script:
     - apt update
     - apt-get install libeigen3-dev
     - poetry install
-    - cd pennylane/benchmark/
-    - echo "Pennylane benchmark"
-    - poetry run python benchmark.py -d default.qubit time bm_entangling_layers > ./output.txt
-    - cd ../../
     - echo "Piquasso vs. StrawberryFields vacuum homodyne benchmark"
     - poetry run python benchmarks/homodyne.py
-  artifacts:
-    paths:
-      - pennylane/benchmark/output.txt
-    expire_in: 15 days
 
 generatewebpage: #`pages` kellene ha szeretnenk gitlab pages-t
   stage: build
-  variables:
-    GIT_SUBMODULE_STRATEGY: none
   rules:
   - if: '$CI_PIPELINE_SOURCE == "merge_request_event" || $CI_PIPELINE_SOURCE == "push"'
   script:
@@ -61,8 +47,6 @@ generatewebpage: #`pages` kellene ha szeretnenk gitlab pages-t
 
 buildpackage:
   stage: build
-  variables:
-    GIT_SUBMODULE_STRATEGY: none
   script:
     - poetry config repositories.gitlab https://gitlab.inf.elte.hu/api/v4/projects/73/packages/pypi
     - poetry build

README.md

@@ -143,15 +143,6 @@ https://gitlab.inf.elte.hu/wigner-rcp-quantum-computing-and-information-group/pi
 References:
 - https://gitlab.inf.elte.hu/help/user/packages/pypi_repository/index.md
 
-## Benchmarking
-
-We can run benckmarks with various pennylane devices, for more details see:
-https://github.com/XanaduAI/pennylane/blob/master/benchmark/README.rst
-For instance:
-```
-cd pennylane/benchmark/
-poetry run python benchmark.py -d default.qubit time bm_entangling_layers
-```
 ### Notes:
 Unfortunatelly running `benchmark.py` with `bm_mutable_rotations` or
 `bm_mutable_complicated_params` will not work. There is a bug in both of these

tox.ini

@@ -11,8 +11,8 @@ isolated_build = True
 whitelist_externals = poetry
 commands =
     poetry install -v
-    poetry run coverage run -m pytest --ignore pennylane
-    poetry run flake8 --exclude='pennylane,.tox,.venv'
+    poetry run coverage run -m pytest
+    poetry run flake8 --exclude='.tox,.venv'
     poetry run coverage xml --omit='.tox/*','*/tests/*'
     poetry run coverage erase