add .gitignore, implement data loading and processing for CIFAR-10 dataset

.gitignore

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+.DS_Store

data/check.py

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+import pickle
+
+data = pickle.load(open('cifar10_test.pkl', 'rb'))
+print(len(data))
+
+data = pickle.load(open('cifar10_train.pkl', 'rb'))
+print(len(data))

data/cifar10_test.pkl

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+version https://git-lfs.github.com/spec/v1
+oid sha256:e9d767f1adff6ee6b86e2bead779815b06696d9824c70202bde1d2eaf712080f
+size 31192668

data/cifar10_train.pkl

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+version https://git-lfs.github.com/spec/v1
+oid sha256:29eaa6cb866dfee892d718507226e8facb9e585abfe153366777671863fe4a9f
+size 155956473

data/patch.py

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+import pickle
+
+data = pickle.load(open('cifar10_test.pkl', 'rb'))
+print(len(data))
+print(len(data[-10000:]))
+# save to cifar10_test.pkl
+with open("cifar10_test.pkl", "wb") as f:
+    pickle.dump(data[-10000:], f)
+print("done")