diff --git a/exp/keras/transformation_matrices.py b/exp/keras/transformation_matrices.py
new file mode 100644
--- /dev/null
+++ b/exp/keras/transformation_matrices.py
@@ -0,0 +1,56 @@
+import math
+import random
+
+import numpy as np
+
+
+def getIdentity():
+	return np.float32([
+		[1,0,0],
+		[0,1,0],
+		[0,0,1]
+	])
+
+
+def getRotation():
+	alpha=random.random()*2*math.pi
+	return np.float32([
+		[math.cos(alpha),math.sin(alpha),0],
+		[-math.sin(alpha),math.cos(alpha),0],
+		[0,0,1]
+	])
+
+
+def getTranslation(dx,dy):
+	return np.float32([
+		[1,0,dx],
+		[0,1,dy],
+		[0,0,1]
+	])
+
+
+def getScale(kx,ky=0):
+	if not ky: ky=kx
+	return np.float32([
+		[kx,0,0],
+		[0,ky,0],
+		[0,0,1]
+	])
+
+
+def getMirroring():
+	return np.float32([
+		[random.choice((1,-1)),0,0],
+		[0,1,0],
+		[0,0,1]
+	])
+
+
+def getProjection():
+	dx=random.uniform(-0.001,0.001)
+	dy=random.uniform(-0.001,0.001)
+	return np.float32([
+		[1,0,0],
+		[0,1,0],
+		[dx,dy,1]
+	])