54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372 | @dataclass
class Model:
name: str
structures: list[Structure]
xyz: tuple[jax.Array, jax.Array, jax.Array, float, float] # arcseconds
dz: float # arcseconds * unknown
beam: jax.Array
n_rounds: int
cur_round: int = 0
chisq: float = np.inf
original_order: list[int] = field(init=False)
def __post_init__(self):
# Make sure the structure is in the order that core expects
structure_idx = np.argsort(
[core.ORDER.index(structure.structure) for structure in self.structures]
)
self.structures = [self.structures[i] for i in structure_idx]
self.original_order = list(np.sort(structure_idx))
def __set_attr__(self, name, value):
if name == "cur_round":
self.__dict__.pop("model_grad", None)
return super().__setattr__(name, value)
@cached_property
def n_struct(self) -> list[int]:
n_struct = [0] * len(core.ORDER)
for structure in self.structures:
idx = core.ORDER.index(structure.structure)
n_struct[idx] += 1
return n_struct
@property
def pars(self) -> list[float]:
pars = []
for structure in self.structures:
pars += [parameter.val for parameter in structure.parameters]
return pars
@cached_property
def par_names(self) -> list[str]:
par_names = []
for structure in self.structures:
par_names += [parameter.name for parameter in structure.parameters]
return par_names
@property
def errs(self) -> list[float]:
errs = []
for structure in self.structures:
errs += [parameter.err for parameter in structure.parameters]
return errs
@cached_property
def priors(self) -> list[Optional[tuple[float, float]]]:
priors = []
for structure in self.structures:
priors += [parameter.prior for parameter in structure.parameters]
return priors
@property
def to_fit(self) -> list[bool]:
to_fit = []
for structure in self.structures:
to_fit += [
parameter.fit[self.cur_round] for parameter in structure.parameters
]
return to_fit
@cached_property
def to_fit_ever(self) -> list[bool]:
to_fit = []
for structure in self.structures:
to_fit += [parameter.fit_ever for parameter in structure.parameters]
return to_fit
@cached_property
def model(self) -> jax.Array:
return core.model(
self.xyz,
tuple(self.n_struct),
self.dz,
self.beam,
*self.pars,
)
def to_tod(self, dx, dy) -> jax.Array:
"""
Project the model into a TOD.
Arguments:
dx: The RA TOD in arcseconds.
dy: The Dec TOD in arcseconds.
Returns:
tod: The model as a TOD.
Same shape as dx.
"""
return wu.bilinear_interp(
dx, dy, self.xyz[0].ravel(), self.xyz[1].ravel(), self.model
)
@cached_property
def model_grad(self) -> tuple[jax.Array, jax.Array]:
argnums = tuple(np.where(self.to_fit)[0] + core.ARGNUM_SHIFT)
return core.model_grad(
self.xyz,
tuple(self.n_struct),
self.dz,
self.beam,
argnums,
*self.pars,
)
def to_tod_grad(self, dx, dy) -> tuple[jax.Array, jax.Array]:
"""
Project the model and gradient into a TOD.
Arguments:
dx: The RA TOD in arcseconds.
dy: The Dec TOD in arcseconds.
Returns:
tod: The model as a TOD.
Same shape as dx.
grad_tod: The gradient a TOD.
Has shape (npar,) + dx.shape
"""
model, grad = self.model_grad
tod = wu.bilinear_interp(
dx, dy, self.xyz[0].ravel(), self.xyz[1].ravel(), model
)
grad_tod = jnp.array(
[
(
wu.bilinear_interp(
dx, dy, self.xyz[0].ravel(), self.xyz[1].ravel(), _grad
)
if _fit
else jnp.zeros_like(tod)
)
for _grad, _fit in zip(grad, self.to_fit)
]
)
return tod, grad_tod
def __repr__(self) -> str:
rep = self.name + ":\n"
rep += f"Round {self.cur_round + 1} out of {self.n_rounds}\n"
for i in self.original_order:
struct = self.structures[i]
rep += "\t" + struct.name + ":\n"
for par in struct.parameters:
rep += (
"\t\t"
+ par.name
+ "*" * par.fit[self.cur_round]
+ str(par.prior) * (par.prior is not None)
+ " = "
+ str(par.val)
+ " ± "
+ str(par.err)
+ "\n"
)
rep += f"chisq is {self.chisq}"
return rep
def update(self, vals, errs, chisq):
if not np.array_equal(self.pars, vals):
self.__dict__.pop("model", None)
self.__dict__.pop("model_grad", None)
n = 0
for struct in self.structures:
for par in struct.parameters:
par.val = vals[n]
par.err = errs[n]
n += 1
self.chisq = chisq
def minkasi_helper(
self, params: NDArray[np.floating], tod: Tod
) -> tuple[NDArray[np.floating], NDArray[np.floating]]:
"""
Helper function to work with minkasi fitting routines.
Arguments:
params: An array of model parameters.
tod: A minkasi tod instance.
'dx' and 'dy' must be in tod.info and be in radians.
Returns:
grad: The gradient of the model with respect to the model parameters.
pred: The model with the specified substructure.
"""
self.update(params, self.errs, self.chisq)
dx = tod.info["dx"] * wu.rad_to_arcsec
dy = tod.info["dy"] * wu.rad_to_arcsec
pred_tod, grad_tod = self.to_tod_grad(dx, dy)
pred_tod = jax.device_get(pred_tod)
grad_tod = jax.device_get(grad_tod)
return grad_tod, pred_tod
def save(self, path: str):
"""
Serialize the model to a file with dill.
Arguments:
path: The file to save to.
"""
with open(path, "wb") as f:
dill.dump(self, f)
@classmethod
def load(cls, path: str) -> Self:
"""
Load the model from a file with dill.
Arguments:
path: The path to the saved model
"""
with open(path, "rb") as f:
return dill.load(f)
@classmethod
def from_cfg(cls, cfg: dict) -> Self:
"""
Create an instance of model from a witch config.
Arguments:
cfg: Config loaded into a dict.
"""
# Do imports
for module, name in cfg.get("imports", {}).items():
mod = import_module(module)
if isinstance(name, str):
locals()[name] = mod
elif isinstance(name, list):
for n in name:
locals()[n] = getattr(mod, n)
else:
raise TypeError("Expect import name to be a string or a list")
# Load constants
constants = {
name: eval(str(const)) for name, const in cfg.get("constants", {}).items()
} # pyright: ignore [reportUnusedVariable]
# Get jax device
dev_id = cfg.get("jax_device", 0)
device = jax.devices()[dev_id]
# Setup coordindate stuff
r_map = eval(str(cfg["coords"]["r_map"]))
dr = eval(str(cfg["coords"]["dr"]))
dz = eval(str(cfg["coords"].get("dz", dr)))
x0 = eval(str(cfg["coords"]["x0"]))
y0 = eval(str(cfg["coords"]["y0"]))
xyz_host = wu.make_grid(
r_map, dr, dr, dz, x0 * wu.rad_to_arcsec, y0 * wu.rad_to_arcsec
)
xyz = jax.device_put(xyz_host, device)
xyz[0].block_until_ready()
xyz[1].block_until_ready()
xyz[2].block_until_ready()
# Make beam
beam = wu.beam_double_gauss(
dr,
eval(str(cfg["beam"]["fwhm1"])),
eval(str(cfg["beam"]["amp1"])),
eval(str(cfg["beam"]["fwhm2"])),
eval(str(cfg["beam"]["amp2"])),
)
beam = jax.device_put(beam, device)
n_rounds = cfg.get("n_rounds", 1)
dz = dz * eval(str(cfg["model"]["unit_conversion"]))
structures = []
for name, structure in cfg["model"]["structures"].items():
parameters = []
for par_name, param in structure["parameters"].items():
val = eval(str(param["value"]))
fit = param.get("to_fit", [False] * n_rounds)
if isinstance(fit, bool):
fit = [fit] * n_rounds
if len(fit) != n_rounds:
raise ValueError(
f"to_fit has {len(fit)} entries but we only have {n_rounds} rounds"
)
priors = param.get("priors", None)
if priors is not None:
priors = eval(str(priors))
parameters.append(Parameter(par_name, fit, val, 0.0, priors))
structures.append(Structure(name, structure["structure"], parameters))
name = cfg["model"].get(
"name", "-".join([structure.name for structure in structures])
)
return cls(name, structures, xyz, dz, beam, n_rounds)
|