diff --git a/.github/workflows/cpp_testing.yml b/.github/workflows/cpp_testing.yml
index 5e5c28f7b..e6ad6b892 100644
--- a/.github/workflows/cpp_testing.yml
+++ b/.github/workflows/cpp_testing.yml
@@ -23,7 +23,7 @@ jobs:
       - name: Configure
         run: |
           export MKL_VERSION=`python -c 'from tools.mkl_ver import compatible_mkl_ver;print(compatible_mkl_ver())'`
-          pip install mkl-include==${MKL_VERSION} mkl-static==${MKL_VERSION}
+          pip install --no-cache-dir mkl-include==${MKL_VERSION} mkl-static==${MKL_VERSION}
 
           export _BLAS_INCLUDE_DIR=`python -c 'import os;import sysconfig;data=sysconfig.get_path("data");print(f"{data}{os.sep}include")'`
           export MKL_DIR=`python -c 'import os;import sysconfig;data=sysconfig.get_path("data");print(f"{data}{os.sep}lib{os.sep}cmake{os.sep}mkl")'`
diff --git a/benchmark/sampler/subgraph.py b/benchmark/sampler/subgraph.py
index a5734baeb..3ace1a779 100644
--- a/benchmark/sampler/subgraph.py
+++ b/benchmark/sampler/subgraph.py
@@ -16,7 +16,7 @@ def test_subgraph(dataset, **kwargs):
     t = time.perf_counter()
     for _ in range(10):
         pyg_lib.sampler.subgraph(rowptr, col, nodes)
-    print(f'time={time.perf_counter()-t:.6f} seconds')
+    print(f'time={time.perf_counter() - t:.6f} seconds')
 
     edge_index = to_edge_index(rowptr, col)
     from torch_geometric.utils import subgraph
@@ -24,7 +24,7 @@ def test_subgraph(dataset, **kwargs):
     t = time.perf_counter()
     for _ in range(10):
         subgraph(nodes, edge_index, num_nodes=num_nodes, relabel_nodes=True)
-    print(f'time={time.perf_counter()-t:.6f} seconds')
+    print(f'time={time.perf_counter() - t:.6f} seconds')
 
 
 if __name__ == '__main__':