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jaxtest.py
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import os
from functools import partial
import jax.numpy
import numpy as np
import pytest
from jax._src.sharding_impls import PositionalSharding
from jax.experimental import mesh_utils
from jax.experimental.shard_map import shard_map
from jax.sharding import Mesh, NamedSharding, PartitionSpec as P
from jax_array_info import sharding_info, sharding_vis, print_array_stats, simple_array_info
num_gpus = 8
os.environ['XLA_FLAGS'] = f'--xla_force_host_platform_device_count={num_gpus}'
devices = mesh_utils.create_device_mesh((num_gpus,))
mesh = Mesh(devices, axis_names=('gpus',))
simple_sharding = NamedSharding(mesh, P(None, "gpus"))
devices_2d = mesh_utils.create_device_mesh((num_gpus // 2, 2))
mesh_2d = Mesh(devices_2d, axis_names=('a', 'b'))
devices_3d = mesh_utils.create_device_mesh((num_gpus // 4, 2, 2))
mesh_3d = Mesh(devices_3d, axis_names=('a', 'b', 'c'))
def test_simple(capsys):
arr = jax.numpy.array([1, 2, 3])
sharding_info(arr, "arr")
sharding_vis(arr)
assert capsys.readouterr().out == """
╭──── arr ─────╮
│ shape: (3,) │
│ dtype: int32 │
│ size: 12.0 B │
│ not sharded │
╰──────────────╯
┌───────┐
│ CPU 0 │
└───────┘
""".lstrip()
def test_not_sharded(capsys):
arr = jax.numpy.zeros(shape=(10, 10, 10), dtype=jax.numpy.complex64)
sharding_info(arr)
sharding_vis(arr)
assert capsys.readouterr().out == """
╭─────────────────────╮
│ shape: (10, 10, 10) │
│ dtype: complex64 │
│ size: 7.8 KiB │
│ not sharded │
╰─────────────────────╯
───────────── showing dims [0, 1] from original shape (10, 10, 10) ─────────────
┌───────┐
│ │
│ │
│ │
│ │
│ CPU 0 │
│ │
│ │
│ │
│ │
└───────┘
""".lstrip()
def test_device_put_sharded(capsys):
arr = jax.numpy.zeros(shape=(8 * 4, 8 * 4, 8 * 4), dtype=jax.numpy.complex64)
arr = jax.device_put(arr, simple_sharding)
sharding_info(arr)
sharding_vis(arr)
assert capsys.readouterr().out == """
╭─────────────────────────────────────────────╮
│ shape: (32, 32, 32) │
│ dtype: complex64 │
│ size: 256.0 KiB │
│ NamedSharding: P(None, 'gpus') │
│ axis 1 is sharded: CPU 0 contains 0:4 (1/8) │
│ Total size: 32 │
╰─────────────────────────────────────────────╯
───────────── showing dims [0, 1] from original shape (32, 32, 32) ─────────────
┌───────┬───────┬───────┬───────┬───────┬───────┬───────┬───────┐
│ │ │ │ │ │ │ │ │
│ │ │ │ │ │ │ │ │
│ │ │ │ │ │ │ │ │
│ │ │ │ │ │ │ │ │
│ CPU 0 │ CPU 1 │ CPU 2 │ CPU 3 │ CPU 4 │ CPU 5 │ CPU 6 │ CPU 7 │
│ │ │ │ │ │ │ │ │
│ │ │ │ │ │ │ │ │
│ │ │ │ │ │ │ │ │
│ │ │ │ │ │ │ │ │
└───────┴───────┴───────┴───────┴───────┴───────┴───────┴───────┘
""".lstrip()
def test_operator_sharded(capsys):
arr = jax.numpy.zeros(shape=(8 * 4, 8 * 4, 8 * 4), dtype=jax.numpy.complex64)
arr = jax.device_put(arr, simple_sharding)
arr = arr * 2
sharding_info(arr)
sharding_vis(arr)
assert capsys.readouterr().out == """
╭─────────────────────────────────────────────╮
│ shape: (32, 32, 32) │
│ dtype: complex64 │
│ size: 256.0 KiB │
│ NamedSharding: P(None, 'gpus') │
│ axis 1 is sharded: CPU 0 contains 0:4 (1/8) │
│ Total size: 32 │
╰─────────────────────────────────────────────╯
───────────── showing dims [0, 1] from original shape (32, 32, 32) ─────────────
┌───────┬───────┬───────┬───────┬───────┬───────┬───────┬───────┐
│ │ │ │ │ │ │ │ │
│ │ │ │ │ │ │ │ │
│ │ │ │ │ │ │ │ │
│ │ │ │ │ │ │ │ │
│ CPU 0 │ CPU 1 │ CPU 2 │ CPU 3 │ CPU 4 │ CPU 5 │ CPU 6 │ CPU 7 │
│ │ │ │ │ │ │ │ │
│ │ │ │ │ │ │ │ │
│ │ │ │ │ │ │ │ │
│ │ │ │ │ │ │ │ │
└───────┴───────┴───────┴───────┴───────┴───────┴───────┴───────┘
""".lstrip()
def test_jit_out_sharding_sharded(capsys):
arr = jax.numpy.zeros(shape=(8 * 4, 8 * 4, 8 * 4), dtype=jax.numpy.complex64)
def func(x):
return x * 2
func = jax.jit(func, out_shardings=simple_sharding)
arr = func(arr)
sharding_info(arr)
sharding_vis(arr)
assert capsys.readouterr().out == """
╭─────────────────────────────────────────────╮
│ shape: (32, 32, 32) │
│ dtype: complex64 │
│ size: 256.0 KiB │
│ NamedSharding: P(None, 'gpus') │
│ axis 1 is sharded: CPU 0 contains 0:4 (1/8) │
│ Total size: 32 │
╰─────────────────────────────────────────────╯
───────────── showing dims [0, 1] from original shape (32, 32, 32) ─────────────
┌───────┬───────┬───────┬───────┬───────┬───────┬───────┬───────┐
│ │ │ │ │ │ │ │ │
│ │ │ │ │ │ │ │ │
│ │ │ │ │ │ │ │ │
│ │ │ │ │ │ │ │ │
│ CPU 0 │ CPU 1 │ CPU 2 │ CPU 3 │ CPU 4 │ CPU 5 │ CPU 6 │ CPU 7 │
│ │ │ │ │ │ │ │ │
│ │ │ │ │ │ │ │ │
│ │ │ │ │ │ │ │ │
│ │ │ │ │ │ │ │ │
└───────┴───────┴───────┴───────┴───────┴───────┴───────┴───────┘
""".lstrip()
def test_positional_sharded(capsys):
arr = jax.numpy.zeros(shape=(8 * 4), dtype=jax.numpy.complex64)
arr = jax.device_put(arr, PositionalSharding(devices))
sharding_info(arr)
sharding_vis(arr)
assert capsys.readouterr().out == """
╭───────────────────────────────────────────────────────────────────╮
│ shape: (32,) │
│ dtype: complex64 │
│ size: 256.0 B │
│ PositionalSharding: │
│ [{CPU 0} {CPU 1} {CPU 2} {CPU 3} {CPU 4} {CPU 5} {CPU 6} {CPU 7}] │
│ axis 0 is sharded: CPU 0 contains 0:4 (1/8) │
│ Total size: 32 │
╰───────────────────────────────────────────────────────────────────╯
┌───────┬───────┬───────┬───────┬───────┬───────┬───────┬───────┐
│ CPU 0 │ CPU 1 │ CPU 2 │ CPU 3 │ CPU 4 │ CPU 5 │ CPU 6 │ CPU 7 │
└───────┴───────┴───────┴───────┴───────┴───────┴───────┴───────┘
""".lstrip()
def test_in_jit(capsys):
arr = jax.numpy.zeros(shape=(8 * 4, 8 * 4, 8 * 4), dtype=jax.numpy.complex64)
arr = jax.device_put(arr, simple_sharding)
def func(x):
sharding_info(x)
sharding_vis(x)
return x * 2
func = jax.jit(func)
func(arr)
assert capsys.readouterr().out == """
╭─────────────────────────────────────────────╮
│ shape: (32, 32, 32) │
│ dtype: complex64 │
│ size: 256.0 KiB │
│ called in jit │
│ NamedSharding: P(None, 'gpus') │
│ axis 1 is sharded: CPU 0 contains 0:4 (1/8) │
│ Total size: 32 │
╰─────────────────────────────────────────────╯
───────────── showing dims [0, 1] from original shape (32, 32, 32) ─────────────
┌───────┬───────┬───────┬───────┬───────┬───────┬───────┬───────┐
│ │ │ │ │ │ │ │ │
│ │ │ │ │ │ │ │ │
│ │ │ │ │ │ │ │ │
│ │ │ │ │ │ │ │ │
│ CPU 0 │ CPU 1 │ CPU 2 │ CPU 3 │ CPU 4 │ CPU 5 │ CPU 6 │ CPU 7 │
│ │ │ │ │ │ │ │ │
│ │ │ │ │ │ │ │ │
│ │ │ │ │ │ │ │ │
│ │ │ │ │ │ │ │ │
└───────┴───────┴───────┴───────┴───────┴───────┴───────┴───────┘
""".lstrip()
def test_pmap(capsys):
arr = jax.numpy.zeros(shape=(8, 8 * 3), dtype=jax.numpy.complex64)
arr = jax.pmap(lambda x: x ** 2)(arr)
sharding_info(arr)
sharding_vis(arr)
assert capsys.readouterr().out == """
╭──────────────────────────────────────────────────────────────────────╮
│ shape: (8, 24) │
│ dtype: complex64 │
│ size: 1.5 KiB │
│ PmapSharding(sharding_spec=ShardingSpec((Chunked(8), NoSharding()), │
│ (ShardedAxis(axis=0),)), device_ids=[0, 1, 2, 3, 4, 5, 6, 7], │
│ device_platform=CPU, device_shape=(8,)) │
╰──────────────────────────────────────────────────────────────────────╯
Output for PmapSharding might be incorrect
┌─────────────────────────────────────────────────────────────────────────┐
│ CPU 0 │
├─────────────────────────────────────────────────────────────────────────┤
│ CPU 1 │
├─────────────────────────────────────────────────────────────────────────┤
│ CPU 2 │
├─────────────────────────────────────────────────────────────────────────┤
│ CPU 3 │
├─────────────────────────────────────────────────────────────────────────┤
│ CPU 4 │
├─────────────────────────────────────────────────────────────────────────┤
│ CPU 5 │
├─────────────────────────────────────────────────────────────────────────┤
│ CPU 6 │
├─────────────────────────────────────────────────────────────────────────┤
│ CPU 7 │
└─────────────────────────────────────────────────────────────────────────┘
""".lstrip()
def test_numpy(capsys):
arr = np.zeros(shape=(10, 10, 10))
sharding_info(arr)
with pytest.raises(ValueError, match="is not a jax array, got <class 'numpy.ndarray'>"):
sharding_vis(arr)
assert capsys.readouterr().out == """
╭─────────────────────╮
│ shape: (10, 10, 10) │
│ dtype: float64 │
│ size: 7.8 KiB │
│ numpy array │
╰─────────────────────╯
""".lstrip()
def test_2d_sharded(capsys):
arr = jax.numpy.zeros(shape=(8 * 4, 8 * 4, 8 * 4), dtype=jax.numpy.complex64)
arr = jax.device_put(arr, NamedSharding(mesh_2d, P(None, "a", "b")))
sharding_info(arr)
sharding_vis(arr)
assert capsys.readouterr().out == """
╭──────────────────────────────────────────────╮
│ shape: (32, 32, 32) │
│ dtype: complex64 │
│ size: 256.0 KiB │
│ NamedSharding: P(None, 'a', 'b') │
│ axis 1 is sharded: CPU 0 contains 0:8 (1/4) │
│ Total size: 32 │
│ axis 2 is sharded: CPU 0 contains 0:16 (1/2) │
│ Total size: 32 │
╰──────────────────────────────────────────────╯
───────────── showing dims [1, 2] from original shape (32, 32, 32) ─────────────
┌───────┬───────┐
│ CPU 0 │ CPU 1 │
├───────┼───────┤
│ CPU 2 │ CPU 3 │
├───────┼───────┤
│ CPU 4 │ CPU 5 │
├───────┼───────┤
│ CPU 6 │ CPU 7 │
└───────┴───────┘
""".lstrip()
def test_3d_sharded(capsys):
arr = jax.numpy.zeros(shape=(8 * 4, 8 * 4, 8 * 4), dtype=jax.numpy.complex64)
arr = jax.device_put(arr, NamedSharding(mesh_3d, P("a", "b", "c")))
sharding_info(arr)
with pytest.raises(NotImplementedError,
match=r"can only visualize up to 2 sharded dimension. \[0, 1, 2\] are sharded."):
sharding_vis(arr)
assert capsys.readouterr().out == """
╭──────────────────────────────────────────────╮
│ shape: (32, 32, 32) │
│ dtype: complex64 │
│ size: 256.0 KiB │
│ NamedSharding: P('a', 'b', 'c') │
│ axis 0 is sharded: CPU 0 contains 0:16 (1/2) │
│ Total size: 32 │
│ axis 1 is sharded: CPU 0 contains 0:16 (1/2) │
│ Total size: 32 │
│ axis 2 is sharded: CPU 0 contains 0:16 (1/2) │
│ Total size: 32 │
╰──────────────────────────────────────────────╯
""".lstrip()
def test_shard_map(capsys):
"""
https://jax.readthedocs.io/en/latest/jep/14273-shard-map.html
"""
arr = jax.numpy.zeros(shape=(16, 16))
@partial(shard_map, mesh=mesh, in_specs=P(None, 'gpus'), out_specs=P(None, 'gpus'))
def test(a):
# sharding_info(a,"input") # doesn't seem to work inside a shard_map
return a ** 2
out = test(arr)
sharding_info(out)
assert capsys.readouterr().out == """
╭─────────────────────────────────────────────╮
│ shape: (16, 16) │
│ dtype: float32 │
│ size: 1.0 KiB │
│ NamedSharding: P(None, 'gpus') │
│ axis 1 is sharded: CPU 0 contains 0:2 (1/8) │
│ Total size: 16 │
╰─────────────────────────────────────────────╯
""".lstrip()
def test_simple_array_info(capsys):
arr = jax.numpy.zeros(shape=(8 * 4, 8 * 4, 8 * 4), dtype=jax.numpy.complex64)
arr = jax.device_put(arr, simple_sharding)
simple_array_info(arr)
assert capsys.readouterr().out == """
╭─────────────────────────────────────────────╮
│ shape: (32, 32, 32) │
│ dtype: complex64 │
│ size: 256.0 KiB │
│ NamedSharding: P(None, 'gpus') │
│ axis 1 is sharded: CPU 0 contains 0:4 (1/8) │
│ Total size: 32 │
╰─────────────────────────────────────────────╯
""".lstrip()
def test_inside_shard_map(capsys):
arr = jax.numpy.zeros(shape=(16, 16))
def test(a):
sharding_info(a, "input")
return a ** 2
with pytest.raises(NotImplementedError) as e_info:
func_shard_map = shard_map(test, mesh=mesh, in_specs=P(None, 'gpus'), out_specs=P(None, 'gpus'))
out = func_shard_map(arr)
def test_inside_shard_map_failing(capsys):
arr = jax.numpy.zeros(shape=(16, 16))
def test(a):
sharding_info(a, "input")
return a ** 2
with pytest.raises(NotImplementedError) as e_info:
func_shard_map = shard_map(test, mesh=mesh, in_specs=P(None, 'gpus'), out_specs=P(None, 'gpus'))
out = func_shard_map(arr)
def test_inside_shard_map_simple(capsys):
arr = jax.numpy.zeros(shape=(16, 16))
def test(a):
simple_array_info(a, "input")
return a ** 2
func_shard_map = shard_map(test, mesh=mesh, in_specs=P(None, 'gpus'), out_specs=P(None, 'gpus'))
out = func_shard_map(arr)
assert capsys.readouterr().out == """
╭──── input ─────╮
│ shape: (16, 2) │
│ dtype: float32 │
│ size: 128.0 B │
│ called in jit │
╰────────────────╯
""".lstrip()
def test_indirectly_sharded(capsys):
"""
y is never explicitly sharded, but it seems like the sharding is back-propagated through the jit compiled function
"""
arr = jax.numpy.zeros(shape=(16, 16, 16))
def func(x):
y = jax.numpy.zeros(shape=(16, 16, 16))
sharding_info(y)
return x * y
func = jax.jit(func, out_shardings=simple_sharding)
arr = func(arr)
assert capsys.readouterr().out == """
╭─────────────────────────────────────────────╮
│ shape: (16, 16, 16) │
│ dtype: float32 │
│ size: 16.0 KiB │
│ called in jit │
│ NamedSharding: P(None, 'gpus') │
│ axis 1 is sharded: CPU 0 contains 0:2 (1/8) │
│ Total size: 16 │
╰─────────────────────────────────────────────╯
""".lstrip()
def test_with_sharding_constraint(capsys):
arr = jax.numpy.zeros(shape=(16, 16, 16))
def func(x):
return jax.lax.with_sharding_constraint(x, simple_sharding)
func = jax.jit(func)
arr = func(arr)
sharding_info(arr)
assert capsys.readouterr().out == """
╭─────────────────────────────────────────────╮
│ shape: (16, 16, 16) │
│ dtype: float32 │
│ size: 16.0 KiB │
│ NamedSharding: P(None, 'gpus') │
│ axis 1 is sharded: CPU 0 contains 0:2 (1/8) │
│ Total size: 16 │
╰─────────────────────────────────────────────╯
""".lstrip()
def test_sharding_outer_product(capsys):
arr = jax.numpy.arange(16)
arr = jax.device_put(arr, NamedSharding(mesh, P("gpus")))
product = jax.numpy.outer(arr, arr)
assert product.shape == (16, 16)
sharding_info(product)
assert capsys.readouterr().out == """
╭─────────────────────────────────────────────╮
│ shape: (16, 16) │
│ dtype: int32 │
│ size: 1.0 KiB │
│ NamedSharding: P('gpus',) │
│ axis 0 is sharded: CPU 0 contains 0:2 (1/8) │
│ Total size: 16 │
╰─────────────────────────────────────────────╯
""".lstrip()
def test_array_stats(capsys):
for buf in jax.live_arrays(): buf.delete()
arr = jax.numpy.zeros(shape=(16, 16, 16))
arr2 = jax.device_put(jax.numpy.zeros(shape=(2, 16, 4)), simple_sharding)
print_array_stats()
assert capsys.readouterr().out == """
allocated jax arrays
┏━━━━━━━━━━┳━━━━━━━━━━━━━━┳━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━┓
┃ size ┃ shape ┃ dtype ┃ sharded ┃
┡━━━━━━━━━━╇━━━━━━━━━━━━━━╇━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━┩
│ 16.0 KiB │ (16, 16, 16) │ float32 │ │
│ 64.0 B │ (2, 16, 4) │ float32 │ ✔ (512.0 B total) │
├──────────┼──────────────┼─────────┼───────────────────┤
│ 16.1 KiB │ │ │ │
└──────────┴──────────────┴─────────┴───────────────────┘
""".lstrip("\n")
def test_non_array(capsys):
arr = [1, 2, 3]
with pytest.raises(ValueError, match="is not a jax array, got <class 'list'>"):
sharding_info(arr)
with pytest.raises(ValueError, match="is not a jax array, got <class 'list'>"):
sharding_vis(arr)
if __name__ == '__main__':
test_indirectly_sharded(None)