refactor(gui): avoid compiling from two processes at once

gui/app.py

@@ -150,7 +150,6 @@ class AdvancedSettings:
             label="Optimizer Iterations",
             step=1,
         )
-        # Bool:
         self.batching = gr.Checkbox(
             value=False,
             label="Batching",

gui/processing.py

@@ -39,8 +39,6 @@ def pysr_fit(queue: mp.Queue, out_queue: mp.Queue):
 
 
 def pysr_predict(queue: mp.Queue, out_queue: mp.Queue):
-    import pysr
-
     while True:
         args = queue.get()
 
@@ -61,6 +59,10 @@ def pysr_predict(queue: mp.Queue, out_queue: mp.Queue):
         os.system(f"cp {equation_file_bkup} {equation_file_copy}")
         os.system(f"cp {equation_file_pkl} {equation_file_pkl_copy}")
 
+        # Note that we import pysr late in this process to avoid
+        # pre-compiling the code in two places at once
+        import pysr
+
         try:
             model = pysr.PySRRegressor.from_file(equation_file_pkl_copy, verbosity=0)
         except pd.errors.EmptyDataError:
@@ -181,7 +183,10 @@ def processing(
         )
     )
     while PERSISTENT_WRITER.out_queue.empty():
-        if equation_file.exists():
+        if (
+            equation_file.exists()
+            and Path(str(equation_file).replace(".csv", ".pkl")).exists()
+        ):
             # First, copy the file to a the copy file
             PERSISTENT_READER.queue.put(
                 dict(