simplify pimcomp compare workflow

validation/raptor_validation/raptor.py

@@ -1,5 +1,6 @@
 import re
 import shlex
+import shutil
 import subprocess
 from pathlib import Path
 from colorama import Fore, Style
@@ -43,6 +44,10 @@ def _format_command(cmd):
 def compile_with_raptor(network_path, raptor_onnx_path: Path, output_base: Path,
                         crossbar_size, crossbar_count, core_count,
                         raptor_extra_args, cwd, verbose, reporter, timeout_sec):
+    pim_dir = Path(output_base).parent / "pim"
+    if pim_dir.exists():
+        shutil.rmtree(pim_dir)
+
     # Define the arguments, with the possibility to set crossbar size and count
     args = [
         network_path,