def __init__(self, initializers, sizes, validate_args=False):
self._initializers = initializers<EOL>self._sizes = sizes<EOL>self._validate_args = validate_args<EOL>
Creates the `BlockwiseInitializer`.

        Arguments:
          initializers: `list` of Keras initializers, e.g., `"glorot_uniform"` or
            `tf.keras.initializers.Constant(0.5413)`.
          sizes: `list` of `int` scalars representing the number of elements
            associated with each initializer in `initializers`.
          validate_args: Python `bool` indicating we should do (possibly expensive)
            graph-time assertions, if necessary.