replaced xargs by standard pip install for all steps it is not required (keep...

replaced xargs by standard pip install for all steps it is not required (keep only for tests from scratch) to save time

.gitlab-ci.yml

@@ -72,7 +72,7 @@ tests (on GPU):
     - chmod +x ./CI/update_badge.sh
     - ./CI/update_badge.sh > /dev/null
   script:
-    - cat requirements.txt | cut -f1 -d"#" | sed '/^\s*$/d' | xargs -L 1 pip install
+    - pip install -r requirements.txt
     - chmod +x ./CI/run_pytest.sh
     - ./CI/run_pytest.sh
   after_script:
@@ -96,7 +96,7 @@ tests:
     - chmod +x ./CI/update_badge.sh
     - ./CI/update_badge.sh > /dev/null
   script:
-    - cat requirements.txt | cut -f1 -d"#" | sed '/^\s*$/d' | xargs -L 1 pip install
+    - pip install -r requirements.txt
     - chmod +x ./CI/run_pytest.sh
     - ./CI/run_pytest.sh
   after_script:
@@ -120,7 +120,7 @@ coverage:
     - chmod +x ./CI/update_badge.sh
     - ./CI/update_badge.sh > /dev/null
   script:
-    - cat requirements.txt | cut -f1 -d"#" | sed '/^\s*$/d' | xargs -L 1 pip install
+    - pip install -r requirements.txt
     - chmod +x ./CI/run_pytest_coverage.sh
     - ./CI/run_pytest_coverage.sh
   after_script:
@@ -142,7 +142,7 @@ sphinx docs:
     - chmod +x ./CI/update_badge.sh
     - ./CI/update_badge.sh > /dev/null
   script:
-    - cat requirements.txt | cut -f1 -d"#" | sed '/^\s*$/d' | xargs -L 1 pip install
+    - pip install -r requirements.txt
     - pip install -r docs/requirements_docs.txt
     - chmod +x ./CI/create_documentation.sh
     - ./CI/create_documentation.sh