Vertically stack arrays.
JAX implementation of numpy.vstack().
For arrays of two or more dimensions, this is equivalent to jax.numpy.concatenate() with axis=0.
tup (np.ndarray | Array | Sequence[ArrayLike]) – a sequence of arrays to stack; each must have the same shape along all but the first axis. If a single array is given it will be treated equivalently to tup = unstack(tup), but the implementation will avoid explicit unstacking.
dtype (DTypeLike | None | None) – optional dtype of the resulting array. If not specified, the dtype will be determined via type promotion rules described in Type promotion semantics.
the stacked result.
Examples
Scalar values:
>>> jnp.vstack([1, 2, 3])
Array([[1],
[2],
[3]], dtype=int32, weak_type=True)
1D arrays:
>>> x = jnp.arange(4)
>>> y = jnp.ones(4)
>>> jnp.vstack([x, y])
Array([[0., 1., 2., 3.],
[1., 1., 1., 1.]], dtype=float32)
2D arrays:
>>> x = x.reshape(1, 4)
>>> y = y.reshape(1, 4)
>>> jnp.vstack([x, y])
Array([[0., 1., 2., 3.],
[1., 1., 1., 1.]], dtype=float32)
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