Code clean-up using black and flake8

 - No functional change

Signed-off-by: Tim Hall <tim.hall@arm.com>
Change-Id: I5ab1198b9d092cd041fa9b85b2dee9900d299bfc
diff --git a/ethosu/vela/weight_compressor.py b/ethosu/vela/weight_compressor.py
index df2b057..c5f4ce1 100644
--- a/ethosu/vela/weight_compressor.py
+++ b/ethosu/vela/weight_compressor.py
@@ -19,6 +19,7 @@
 from collections import namedtuple
 
 import numpy as np
+from ethosu import mlw_codec
 
 from .data_type import DataType
 from .errors import UnsupportedFeatureError
@@ -31,7 +32,6 @@
 from .tensor import TensorFormat
 from .tensor import TensorPurpose
 from .tensor import TensorSubPurpose
-from ethosu import mlw_codec
 
 
 # Contains meta info for a weight compression. If two tensors have identical weight compression config,
@@ -236,7 +236,7 @@
 
     if tens.consumer_list[0].type == "Conv2DBackpropInputSwitchedBias":
         # Transpose Convoluion, reverse weights in H and W axes
-        weights = np.flip(weights, axis=(0,1))
+        weights = np.flip(weights, axis=(0, 1))
 
     # Slice weight stream up depth-ways into bricks and compress
     full_ofm_depth = quant_buf.shape[-1]