我试图运行一个注意力模型，但当我尝试导入spatial_transformer时，它说没有名为'spatial_transformer'的模块，所以我尝试使用'pip install spatial_transformer'，但结果是'No matching distribution found for spatialtransformer'。我搜索这个问题，看到其他人使用相同的代码“from spatial_transformer import SpatialTransformer”，所以我想知道如何安装这个软件包，谢谢！
PS：我的代码如下：

import numpy as np
import keras
import keras.backend as K
import matplotlib.pyplot as plt
from scipy.misc import imresize
from keras.datasets import mnist
from keras.models import Sequential
from keras.layers.core import Dense, Dropout, Activation, Flatten
from keras.layers.convolutional import Convolution2D, MaxPooling2D, 
Conv2D
from keras.layers import Input
from keras.utils import np_utils, generic_utils
from keras.optimizers import Adam, SGD
from spatial_transformer import SpatialTransformer
#from stn.transformer import spatial_transformer_network
%matplotlib inline

np.random.seed(1337)  # for reproducibility
batch_size = 128
nb_classes = 10
nb_epoch = 12