Fixed generate_per_layer_tests.py (#3470)

Author: veblush

tensorflow/lite/micro/integration_tests/generate_per_layer_tests.py

@@ -85,7 +85,7 @@ def generate_single_layer_model(self, model, subgraph, op, opcode_idx):
       if buffer.data is not None and len(tensor.shape) > 2:
         for i in range(len(buffer.data)):
           buffer.data[i] = buffer.data[i] * np.random.uniform(
-              low=0.5, high=1.0, size=1)
+              low=0.5, high=1.0)
 
         all_equal = True
         for i, elem in enumerate(buffer.data):