tensorsor快速获取所有变量，和快速计算L2范数

    for var in tf.trainable_variables():
        print (var.name)
        print (var.get_shape())
        print (sess.run(tf.nn.l2_loss(var)))

    for var in tf.trainable_variables():
        if var.op.name.startswith("InceptionV4/Logits/Logits/weights"):
            print (var)
            print (var.get_shape())
            print (sess.run(tf.nn.l2_loss(var)))

    # var.name:  "InceptionV4/Logits/Logits/weights:0"
    # var.op.name: "InceptionV4/Logits/Logits/weights"
    # var.name.split(':')[0].split('/')[-1]  
    for var in tf.trainable_variables():
        #if (var.name.split(':')[0].split('/')[-1] == "weights"):
        if (var.op.name.split('/')[-1] == "weights"):
            print (var)
            print (var.get_shape())
            print (sess.run(tf.nn.l2_loss(var)))