diff --git a/src/baskerville/metrics.py b/src/baskerville/metrics.py
index a1cbfaf..58d69ce 100644
--- a/src/baskerville/metrics.py
+++ b/src/baskerville/metrics.py
@@ -128,7 +128,7 @@ def poisson_multinomial(
         rescale (bool): Rescale loss after re-weighting.
     """
     seq_len = y_true.shape[1]
-    
+
     if weight_range < 1:
         raise ValueError("Poisson Multinomial weight_range must be >=1")
     elif weight_range == 1:
@@ -147,8 +147,8 @@ def poisson_multinomial(
     y_pred = tf.math.multiply(y_pred, position_weights)
 
     # sum across lengths
-    s_true = tf.math.reduce_sum(y_true, axis=-2) # B x T
-    s_pred = tf.math.reduce_sum(y_pred, axis=-2) # B x T
+    s_true = tf.math.reduce_sum(y_true, axis=-2)  # B x T
+    s_pred = tf.math.reduce_sum(y_pred, axis=-2)  # B x T
 
     # total count poisson loss, mean across targets
     poisson_term = poisson(s_true, s_pred)  # B x T
@@ -159,7 +159,7 @@ def poisson_multinomial(
     y_pred += epsilon
 
     # normalize to sum to one
-    p_pred = y_pred / tf.expand_dims(s_pred, axis=-2) # B x L x T
+    p_pred = y_pred / tf.expand_dims(s_pred, axis=-2)  # B x L x T
 
     # multinomial loss
     pl_pred = tf.math.log(p_pred)  # B x L x T
diff --git a/tests/test_metrics.py b/tests/test_metrics.py
index de235fb..509384f 100644
--- a/tests/test_metrics.py
+++ b/tests/test_metrics.py
@@ -9,27 +9,29 @@
 # data dimensions
 N, L, T = 6, 8, 4
 
+
 @pytest.fixture
 def sample_data():
     y_true = tf.random.uniform((N, L, T), minval=0, maxval=10, dtype=tf.float32)
     y_pred = y_true + tf.random.normal((N, L, T), mean=0, stddev=0.1)
     return y_true, y_pred
 
+
 def test_PearsonR(sample_data):
     y_true, y_pred = sample_data
     pearsonr = PearsonR(num_targets=T, summarize=False)
     pearsonr.update_state(y_true, y_pred)
     tf_result = pearsonr.result().numpy()
-    
+
     # Compute SciPy result
     scipy_result = np.zeros(T)
     y_true_np = y_true.numpy().reshape(-1, T)
     y_pred_np = y_pred.numpy().reshape(-1, T)
     for i in range(T):
         scipy_result[i], _ = stats.pearsonr(y_true_np[:, i], y_pred_np[:, i])
-    
+
     np.testing.assert_allclose(tf_result, scipy_result, rtol=1e-5, atol=1e-5)
-    
+
     # Test summarized result
     pearsonr_summarized = PearsonR(num_targets=T, summarize=True)
     pearsonr_summarized.update_state(y_true, y_pred)
@@ -37,27 +39,31 @@ def test_PearsonR(sample_data):
     assert tf_result_summarized.shape == ()
     assert np.isclose(tf_result_summarized, np.mean(scipy_result), rtol=1e-5, atol=1e-5)
 
+
 def test_R2(sample_data):
     y_true, y_pred = sample_data
     r2 = R2(num_targets=T, summarize=False)
     r2.update_state(y_true, y_pred)
     tf_result = r2.result().numpy()
-    
+
     # Compute sklearn result
     sklearn_result = np.zeros(T)
     y_true_np = y_true.numpy().reshape(-1, T)
     y_pred_np = y_pred.numpy().reshape(-1, T)
     for i in range(T):
         sklearn_result[i] = r2_score(y_true_np[:, i], y_pred_np[:, i])
-    
+
     np.testing.assert_allclose(tf_result, sklearn_result, rtol=1e-5, atol=1e-5)
-    
+
     # Test summarized result
     r2_summarized = R2(num_targets=T, summarize=True)
     r2_summarized.update_state(y_true, y_pred)
     tf_result_summarized = r2_summarized.result().numpy()
     assert tf_result_summarized.shape == ()
-    assert np.isclose(tf_result_summarized, np.mean(sklearn_result), rtol=1e-5, atol=1e-5)
+    assert np.isclose(
+        tf_result_summarized, np.mean(sklearn_result), rtol=1e-5, atol=1e-5
+    )
+
 
 def test_poisson_multinomial_shape(sample_data):
     y_true, y_pred = sample_data