code: def testInitializerKeysInvalidWithoutBias(self):
      with self.assertRaisesRegex(ValueError, "b_init must be None"):
          depthwise_conv.DepthwiseConv2D(
              channel_multiplier=1,
              kernel_shape=3,
              data_format="NHWC",
              with_bias=False,
              b_init=tf.zeros_initializer(),
          )
  
imports: from absl.testing import parameterized
  import numpy
  from sonnet.src import depthwise_conv
  from sonnet.src import initializers
  from sonnet.src import test_utils
  import tensorflow
label_desc: Use image node_id 1 for calling the DepthwiseConvTest obj's underlying member method code with example usage: obj.testInitializerKeysInvalidWithoutBias() without return types