tf.train.do_quantize_training_on_graphdef

tf.train.do_quantize_training_on_graphdef(
    input_graph,
    num_bits
)

Defined in tensorflow/python/pywrap_tensorflow_internal.py.

A general quantization scheme is being developed in tf.contrib.quantize.

Consider using that instead, though since it is in the tf.contrib namespace, it is not subject to backward compatibility guarantees.