Test model: removed unecessary import

src/tests/test_model.py

@@ -1,5 +1,3 @@
-from sympy.codegen.ast import float64
-
 from rbm.model import Model
 from rbm.entity import Entity, EntityParams
 from rbm.matrix import Mat, np
@@ -49,5 +47,3 @@ if __name__ == "__main__":
 		print(f"Input  : {inp}")
 		print(f"Output : {(out > 0.9).astype(np.float64)}")
 		print(f"Error  : {np.mean((out - inp)**2):0.3f}")
-
-