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e1_preliminaries_ndarray.py

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+import torch
+
+
+def main():
+    print('===== Chapter 1 =====')
+    chapter_1()
+
+
+def chapter_1():
+    x = torch.arange(12)
+    print(f'x: {x}')
+    print(f'x.shape: {x.shape}')
+    print(f'x.numel(): {x.numel()}')
+    xs = x.reshape(3, 4)
+    print(f'x.reshape: {xs}')
+    xs = x.reshape(-1, 4)
+    print(f'x.reshape auto 1: {xs}')
+    xs = x.reshape(3, -1)
+    print(f'x.reshape auto 2: {xs}')
+
+    zeros = torch.zeros((2, 3, 4))
+    print(f'zeros: {zeros}')
+    ones = torch.ones((2, 3, 4))
+    print(f'ones: {ones}')
+
+    randoms = torch.randn(3, 4)
+    print(f'randn: {randoms}')
+
+    manual = torch.tensor([[2, 1, 4, 3], [1, 2, 3, 4], [4, 3, 2, 1]])
+    print(f'manual: {manual}')
+    # 看起来reshape第一个是行数
+    manual = torch.tensor([2, 1, 4, 3, 1, 2, 3, 4, 4, 3, 2, 1]).reshape(3, -1)
+    print(f'manual: {manual}')
+
+
+if __name__ == "__main__":
+    main()