diff --git a/vqls_prototype/matrix_decomposition/matrix_decomposition.py b/vqls_prototype/matrix_decomposition/matrix_decomposition.py
index 7c77a78..915a080 100644
--- a/vqls_prototype/matrix_decomposition/matrix_decomposition.py
+++ b/vqls_prototype/matrix_decomposition/matrix_decomposition.py
@@ -474,7 +474,8 @@ def load(self, filename) -> None:
             filename (str): name of the file
         """
         pauli_strings, coeffs = np.load(filename)
-        self.strings
+        self.strings = pauli_strings
+        self.coefficient = coeffs
         self.circuits = []
         for pauli_string in self.strings:
             self.circuits.append(self._create_circuit(pauli_string))
diff --git a/vqls_prototype/matrix_decomposition/optimized_matrix_decomposition.py b/vqls_prototype/matrix_decomposition/optimized_matrix_decomposition.py
index 8253703..c71caff 100644
--- a/vqls_prototype/matrix_decomposition/optimized_matrix_decomposition.py
+++ b/vqls_prototype/matrix_decomposition/optimized_matrix_decomposition.py
@@ -2,7 +2,7 @@
 import itertools
 from dataclasses import dataclass
 from collections import OrderedDict
-from typing import Optional, Union, List, Tuple, TypeVar
+from typing import Optional, Union, List, TypeVar
 from qiskit.quantum_info import SparsePauliOp
 import numpy as np
 import numpy.typing as npt
diff --git a/vqls_prototype/solver/log.py b/vqls_prototype/solver/log.py
index 8207fe5..7ff379e 100644
--- a/vqls_prototype/solver/log.py
+++ b/vqls_prototype/solver/log.py
@@ -8,8 +8,8 @@ class VQLSLog:
     values: List
     parameters: List
 
-    def update(
+    def update( # pylint: disable=unused-argument
         self, count: int, cost: float, parameters: np.ndarray
-    ) -> None:  # pylint: disable=unused-argument
+    ) -> None:
         self.values.append(cost)
         self.parameters.append(parameters)
diff --git a/vqls_prototype/solver/qst_vqls.py b/vqls_prototype/solver/qst_vqls.py
index e59aec2..5923d4b 100644
--- a/vqls_prototype/solver/qst_vqls.py
+++ b/vqls_prototype/solver/qst_vqls.py
@@ -26,8 +26,6 @@
     VariationalLinearSolverResult,
 )
 
-from ..matrix_decomposition.matrix_decomposition import MatrixDecomposition
-
 from ..matrix_decomposition.optimized_matrix_decomposition import (
     ContractedPauliDecomposition,
 )