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Option to handle conditional input to the func #258

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Option to handle conditional input to the func #258

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3777405
added an option to handle conditional input to the func
rayanirban Dec 14, 2024
b7dd3f6
added an option to handle conditional input to the func
rayanirban Dec 15, 2024
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4 changes: 2 additions & 2 deletions torchdiffeq/_impl/odeint.py
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Original file line number Diff line number Diff line change
Expand Up @@ -31,7 +31,7 @@
}


def odeint(func, y0, t, *, rtol=1e-7, atol=1e-9, method=None, options=None, event_fn=None):
def odeint(func, y0, t, *, rtol=1e-7, atol=1e-9, method=None, options=None, event_fn=None, condition=None):
"""Integrate a system of ordinary differential equations.

Solves the initial value problem for a non-stiff system of first order ODEs:
Expand Down Expand Up @@ -77,7 +77,7 @@ def odeint(func, y0, t, *, rtol=1e-7, atol=1e-9, method=None, options=None, even
solver = SOLVERS[method](func=func, y0=y0, rtol=rtol, atol=atol, **options)

if event_fn is None:
solution = solver.integrate(t)
solution = solver.integrate(t, condition)
else:
event_t, solution = solver.integrate_until_event(t[0], event_fn)
event_t = event_t.to(t)
Expand Down
7 changes: 6 additions & 1 deletion torchdiffeq/_impl/solvers.py
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Original file line number Diff line number Diff line change
Expand Up @@ -99,7 +99,7 @@ def _grid_constructor(func, y0, t):
def _step_func(self, func, t0, dt, t1, y0):
pass

def integrate(self, t):
def integrate(self, t, condition=None):
time_grid = self.grid_constructor(self.func, self.y0, t)
assert time_grid[0] == t[0] and time_grid[-1] == t[-1]

Expand All @@ -108,11 +108,16 @@ def integrate(self, t):

j = 1
y0 = self.y0
if condition is not None:
y0_condition = y0.clone()
for t0, t1 in zip(time_grid[:-1], time_grid[1:]):
dt = t1 - t0
self.func.callback_step(t0, y0, dt)
dy, f0 = self._step_func(self.func, t0, dt, t1, y0)
y1 = y0 + dy
if condition is not None:
#replace all channels of y1 except ch 0 with y0_condition
y1[:,condition:,:,:] = y0_condition[:,condition:,:,:]

while j < len(t) and t1 >= t[j]:
if self.interp == "linear":
Expand Down