MorvanLi / numpyTutorial

numpyTutorial

• 创建和生成

  • np.linspace(start, end, nums)
  • rng.integers/uniform(low, high, size)
  • rng.normal(loc, scale, size)

• 统计和属性

  • arr.shape
  • arr.sum/max/min(axis, keepdims)
  • np.average(arr, axis)

• 形状和转换

  • arr.reshpae/np.reshape
  • np.expand_dims(arr, axis)
  • np.squeeze(arr axis)
  • np.transpose(arr, axis)
  • arr.T

• 分解和组合

  • arr[start:stop:step, ...]
  • np.concatenate((arr1, arr2), axis)
  • np.stack((arr1, arr2), axis)
  • np.repeat(arr, repeat_num, axis)
  • np.split(arr, part_num, axis)

• 筛选和过滤

  • np.where(condition, arr, replaced_val)
  • rng.choice(a, size, replace=False, p=probs_size_equals_a)
  • rng.argmax/argmin/argsort(arr, axis)

• 矩阵和计算

  • +-*/
  • np.dot(a, b) == a.dot(b)
  • np.matmul(a, b) == a @ b

• numpy实现反向传播