def test_to_scalar():
engine = ParticleMeshEngine(pm)
code = CodeSegment(engine)
numpy.random.seed(1234)
s = numpy.random.uniform(size=engine.q.shape) * 0.1
check_grad(code, 's', 's', init={'s': s}, eps=1e-4, rtol=1e-8)
def test_readout():
engine = ParticleMeshEngine(pm)
code = CodeSegment(engine)
s = pm.BoxSize / pm.Nmesh * 0.001 + 0.99 * engine.q / pm.Nmesh # sample all positions.
field = pm.generate_whitenoise(seed=1234, mode='real')
code.get_x(s='s', x='x')
code.decompose(x='x', layout='layout')
code.readout(x='x', mesh='density', layout='layout', value='value')
check_grad(code,
'value',
'density',
init={
'density': field,
's': s
},
eps=1e-4,
rtol=1e-8)
check_grad(code,
'value',
's',
init={
'density': field,
's': s
},
eps=1e-4,
rtol=1e-8)
def test_lowpass():
field = pm.generate_whitenoise(seed=1234, type='real')
engine = ParticleMeshEngine(pm)
code = CodeSegment(engine)
code.lowpass(real='r', Neff=1)
check_grad(code, 'r', 'r', init={'r': field}, eps=1e-4, rtol=1e-8)
def test_c2rr2c():
field = pm.generate_whitenoise(seed=1234, type='real')
engine = ParticleMeshEngine(pm)
code = CodeSegment(engine)
code.r2c(real='r', complex='c')
code.c2r(complex='c', real='r')
check_grad(code, 'r', 'r', init={'r': field}, eps=1e-4, rtol=1e-8)
def test_paint():
engine = ParticleMeshEngine(pm)
code = CodeSegment(engine)
s = pm.BoxSize / pm.Nmesh * 0.001 + 0.99 * engine.q / pm.Nmesh # sample all positions.
code.get_x(s='s', x='x')
code.decompose(x='x', layout='layout')
code.paint(x='x', mesh='density', layout='layout')
check_grad(code, 'density', 's', init={'s': s}, eps=1e-4, rtol=1e-8)
def test_compute():
def transfer(k): return 2.0
engine = ParticleMeshEngine(pm)
code = CodeSegment(engine)
code.r2c(real='r', complex='c')
code.transfer(complex='c', tf=transfer)
code.c2r(complex='c', real='r')
code.to_scalar(x='r', y='sum')
field = pm.generate_whitenoise(seed=1234).c2r()
norm = code.compute('sum', init={'r': field})
assert_allclose(norm, field.cnorm() * 4)
def test_transfer_real():
def transfer(k):
return k[0]
field = pm.generate_whitenoise(seed=1234, type='real')
engine = ParticleMeshEngine(pm)
code = CodeSegment(engine)
code.r2c(complex='c', real='r')
code.transfer(complex='c', tf=transfer)
code.c2r(complex='c', real='r')
check_grad(code, 'r', 'r', init={'r': field}, eps=1e-4, rtol=1e-8)
def test_vjp():
def transfer(k):
k2 = sum(ki **2 for ki in k)
k2[k2 == 0] = 1.0
# return 1 / k2
return 2.0
engine = ParticleMeshEngine(pm)
code = CodeSegment(engine)
code.r2c(real='r', complex='c')
code.transfer(complex='c', tf=transfer)
code.c2r(complex='c', real='r')
code.multiply(x1='r', x2=Literal(0.1), y='r')
code.to_scalar(x='r', y='sum')
field = pm.generate_whitenoise(seed=1234).c2r()
norm, tape = code.compute('sum', init={'r': field}, return_tape=True)
assert_allclose(norm, field.cnorm() * 4 * 0.1 ** 2)
vjp = tape.get_vjp()
_r = vjp.compute('_r', init={'_sum': 1.0})
assert_allclose(_r, field * 4 * 2 * 0.1 * 0.1)
def test_vs():
engine = ParticleMeshEngine(pm)
field = pm.generate_whitenoise(seed=1234)
a = engine.vs.zeros_like(field)
assert_allclose(a, 0)