import?numpy?as?np
import?h5py
import?matplotlib.pyplot?as?plt
from?testCases_v2?import?*
from?dnn_utils_v2?import?sigmoid,?sigmoid_backward,?relu,?relu_backward
%matplotlib?inline
plt.rcParams['figure.figsize']?=?(5.0,?4.0)?#?set?default?size?of?plots
plt.rcParams['image.interpolation']?=?'nearest'
plt.rcParams['image.cmap']?=?'gray'
%load_ext?autoreload
%autoreload?2
np.random.seed(1)從來沒用過%這種用法，所以想問一問%matplotlib inline，%load_ext autoreload，%autoreload 2這些前面打%是什么意思？
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