diff --git a/.gitignore b/.gitignore
index e22fa55..439d703 100644
--- a/.gitignore
+++ b/.gitignore
@@ -119,7 +119,6 @@ dmypy.json
 ._*
 voice-bot-token.txt
 audio_tmp
-src/voice-bot-token.txt
 venv8
 venv9
 
diff --git a/src/accuracy_calculation.py b/experiment/accuracy_calculation.py
similarity index 100%
rename from src/accuracy_calculation.py
rename to experiment/accuracy_calculation.py
diff --git a/src/bot.py b/experiment/bot.py
similarity index 100%
rename from src/bot.py
rename to experiment/bot.py
diff --git a/src/ina_main.py b/experiment/ina_main.py
similarity index 100%
rename from src/ina_main.py
rename to experiment/ina_main.py
diff --git a/src/utils.py b/experiment/utils.py
similarity index 100%
rename from src/utils.py
rename to experiment/utils.py
diff --git a/src/validate_cn_celeb.py b/experiment/validate_cn_celeb.py
similarity index 100%
rename from src/validate_cn_celeb.py
rename to experiment/validate_cn_celeb.py
diff --git a/src/api.py b/src/api.py
index dfbbf72..e3464b8 100644
--- a/src/api.py
+++ b/src/api.py
@@ -1,13 +1,8 @@
-import json
-
-import matplotlib.pyplot as plt
-import numpy as np
 from parselmouth import Sound
 from scipy.stats import gaussian_kde
 
 from statistics import *
 
-
 Feature = Literal['pitch', 'f1', 'f2', 'f3', 'tilt']
 Gender = Literal['f', 'm']
 
@@ -15,7 +10,7 @@ Gender = Literal['f', 'm']
 _kde_functions: dict[Feature, dict[Gender, gaussian_kde]] = {}
 
 
-def load_kde():
+def load_kde() -> dict[Feature, dict[Gender, gaussian_kde]]:
     """
     Load statistical results into kernel density functions