我正在使用PyTorch框架，因为我通过这段代码来怀疑它！

# Create a dataset with Scikit-Learn's make_moons()
from sklearn.datasets import make_moons
num_samples = 1000
RANDOM_SEED = 42
X, y = make_moons(n_samples=num_samples,
                  noise=0.07,
                  random_state=RANDOM_SEED)
len(X), len(y) # here X is a MATRIX features and y is a labels

个字符
c=y和cmap=plt.cm.RdYlBu是什么？