Python numpy.uintp() 使用实例

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Example 1

```def test_same_kind_index_casting(self):
# Indexes should be cast with same-kind and not safe, even if
# that is somewhat unsafe. So test various different code paths.
index = np.arange(5)
u_index = index.astype(np.uintp)
arr = np.arange(10)

assert_array_equal(arr[index], arr[u_index])
arr[u_index] = np.arange(5)
assert_array_equal(arr, np.arange(10))

arr = np.arange(10).reshape(5, 2)
assert_array_equal(arr[index], arr[u_index])

arr[u_index] = np.arange(5)[:,None]
assert_array_equal(arr, np.arange(5)[:,None].repeat(2, axis=1))

arr = np.arange(25).reshape(5, 5)
assert_array_equal(arr[u_index, u_index], arr[index, index]) ```

Example 2

```def get_2d_pointer(numpy_2d_array):
'''Get 2d uint pointer from 2d numpy array

Args:
numpy_2d_array (ndarray(ndim=2)): 2d-numpy array

Returns:
ndarray((numpy_2d_array.shape[0],), ndim=1): numpy uintp array

Notice:
See Original: Sturla Molden's method
http://numpy-discussion.10968.n7.nabble.com/Pass-2d-ndarray-into-C-double-using-ctypes-tp39414p39416.html
'''

return (numpy_2d_array.__array_interface__['data'][0]
+ numpy.arange(numpy_2d_array.shape[0]) * numpy_2d_array.strides[0]).astype(numpy.uintp) ```

Example 3

```def test_same_kind_index_casting(self):
# Indexes should be cast with same-kind and not safe, even if
# that is somewhat unsafe. So test various different code paths.
index = np.arange(5)
u_index = index.astype(np.uintp)
arr = np.arange(10)

assert_array_equal(arr[index], arr[u_index])
arr[u_index] = np.arange(5)
assert_array_equal(arr, np.arange(10))

arr = np.arange(10).reshape(5, 2)
assert_array_equal(arr[index], arr[u_index])

arr[u_index] = np.arange(5)[:,None]
assert_array_equal(arr, np.arange(5)[:,None].repeat(2, axis=1))

arr = np.arange(25).reshape(5, 5)
assert_array_equal(arr[u_index, u_index], arr[index, index]) ```

Example 4

```def test_same_kind_index_casting(self):
# Indexes should be cast with same-kind and not safe, even if
# that is somewhat unsafe. So test various different code paths.
index = np.arange(5)
u_index = index.astype(np.uintp)
arr = np.arange(10)

assert_array_equal(arr[index], arr[u_index])
arr[u_index] = np.arange(5)
assert_array_equal(arr, np.arange(10))

arr = np.arange(10).reshape(5, 2)
assert_array_equal(arr[index], arr[u_index])

arr[u_index] = np.arange(5)[:,None]
assert_array_equal(arr, np.arange(5)[:,None].repeat(2, axis=1))

arr = np.arange(25).reshape(5, 5)
assert_array_equal(arr[u_index, u_index], arr[index, index]) ```

Example 5

```def test_same_kind_index_casting(self):
# Indexes should be cast with same-kind and not safe, even if
# that is somewhat unsafe. So test various different code paths.
index = np.arange(5)
u_index = index.astype(np.uintp)
arr = np.arange(10)

assert_array_equal(arr[index], arr[u_index])
arr[u_index] = np.arange(5)
assert_array_equal(arr, np.arange(10))

arr = np.arange(10).reshape(5, 2)
assert_array_equal(arr[index], arr[u_index])

arr[u_index] = np.arange(5)[:,None]
assert_array_equal(arr, np.arange(5)[:,None].repeat(2, axis=1))

arr = np.arange(25).reshape(5, 5)
assert_array_equal(arr[u_index, u_index], arr[index, index]) ```

Example 6

```def test_same_kind_index_casting(self):
# Indexes should be cast with same-kind and not safe, even if
# that is somewhat unsafe. So test various different code paths.
index = np.arange(5)
u_index = index.astype(np.uintp)
arr = np.arange(10)

assert_array_equal(arr[index], arr[u_index])
arr[u_index] = np.arange(5)
assert_array_equal(arr, np.arange(10))

arr = np.arange(10).reshape(5, 2)
assert_array_equal(arr[index], arr[u_index])

arr[u_index] = np.arange(5)[:,None]
assert_array_equal(arr, np.arange(5)[:,None].repeat(2, axis=1))

arr = np.arange(25).reshape(5, 5)
assert_array_equal(arr[u_index, u_index], arr[index, index]) ```

Example 7

```def test_same_kind_index_casting(self):
# Indexes should be cast with same-kind and not safe, even if that
# is somewhat unsafe. So test various different code paths.
index = np.arange(5)
u_index = index.astype(np.uintp)
arr = np.arange(10)

assert_array_equal(arr[index], arr[u_index])
arr[u_index] = np.arange(5)
assert_array_equal(arr, np.arange(10))

arr = np.arange(10).reshape(5, 2)
assert_array_equal(arr[index], arr[u_index])

arr[u_index] = np.arange(5)[:,None]
assert_array_equal(arr, np.arange(5)[:,None].repeat(2, axis=1))

arr = np.arange(25).reshape(5, 5)
assert_array_equal(arr[u_index, u_index], arr[index, index]) ```

Example 8

```def test_same_kind_index_casting(self):
# Indexes should be cast with same-kind and not safe, even if
# that is somewhat unsafe. So test various different code paths.
index = np.arange(5)
u_index = index.astype(np.uintp)
arr = np.arange(10)

assert_array_equal(arr[index], arr[u_index])
arr[u_index] = np.arange(5)
assert_array_equal(arr, np.arange(10))

arr = np.arange(10).reshape(5, 2)
assert_array_equal(arr[index], arr[u_index])

arr[u_index] = np.arange(5)[:,None]
assert_array_equal(arr, np.arange(5)[:,None].repeat(2, axis=1))

arr = np.arange(25).reshape(5, 5)
assert_array_equal(arr[u_index, u_index], arr[index, index]) ```

Example 9

```def _mat_ptrs(a):
"""Creates an array of pointers to matrices

Args:
a: A batch of matrices on GPU.
Returns:
GPU array of pointers to matrices.
"""
if len(a) == 1:
return cuda.cupy.full((1,), a.data.ptr, dtype=numpy.uintp)
else:
stride = a.strides[0]
ptr = a.data.ptr
return cuda.cupy.arange(ptr, ptr + stride * len(a), stride,
dtype=numpy.uintp) ```