def test_to_python(self):
a = pybamm.StateVector(slice(0, 1))
b = pybamm.StateVector(slice(1, 2))
# test a * b
expr = a + b
constant_str, variable_str = pybamm.to_python(expr)
expected_str = ("var_[0-9m]+ = y\[0:1\].*\\n"
"var_[0-9m]+ = y\[1:2\].*\\n"
"var_[0-9m]+ = var_[0-9m]+ \+ var_[0-9m]+")
self.assertRegex(variable_str, expected_str)
def test_to_python(self):
a = pybamm.StateVector(slice(0, 1))
b = pybamm.StateVector(slice(1, 2))
# test a * b
expr = a + b
constant_str, variable_str = pybamm.to_python(expr)
expected_str = (
"self\.var_[0-9m]+ = y\[:1\]\[\[True\]\].*\\n"
"self\.var_[0-9m]+ = y\[:2\]\[\[False, True\]\].*\\n"
"self\.var_[0-9m]+ = self\.var_[0-9m]+ \+ self\.var_[0-9m]+")
self.assertRegex(variable_str, expected_str)
def __init__(self, symbol):
constants, python_str = pybamm.to_python(symbol, debug=False)
# extract constants in generated function
for i, symbol_id in enumerate(constants.keys()):
const_name = id_to_python_variable(symbol_id, True)
python_str = "{} = constants[{}]\n".format(const_name, i) + python_str
# constants passed in as an ordered dict, convert to list
self._constants = list(constants.values())
# indent code
python_str = " " + python_str
python_str = python_str.replace("\n", "\n ")
# add function def to first line
python_str = (
"def evaluate(constants, t=None, y=None, "
"y_dot=None, inputs=None, known_evals=None):\n" + python_str
)
# calculate the final variable that will output the result of calling `evaluate`
# on `symbol`
result_var = id_to_python_variable(symbol.id, symbol.is_constant())
if symbol.is_constant():
result_value = symbol.evaluate()
# add return line
if symbol.is_constant() and isinstance(result_value, numbers.Number):
python_str = python_str + "\n return " + str(result_value)
else:
python_str = python_str + "\n return " + result_var
# store a copy of examine_jaxpr
python_str = python_str + "\nself._evaluate = evaluate"
self._python_str = python_str
self._result_var = result_var
self._symbol = symbol
# compile and run the generated python code,
compiled_function = compile(python_str, result_var, "exec")
exec(compiled_function)
def __init__(self, symbol):
constants, self._variable_function = pybamm.to_python(symbol,
debug=False)
# store all the constant symbols in the tree as internal variables of this
# object
for symbol_id, value in constants.items():
setattr(
self,
id_to_python_variable(symbol_id, True).replace("self.", ""),
value)
# calculate the final variable that will output the result of calling `evaluate`
# on `symbol`
self._result_var = id_to_python_variable(symbol.id,
symbol.is_constant())
# compile the generated python code
self._variable_compiled = compile(self._variable_function,
self._result_var, "exec")
# compile the line that will return the output of `evaluate`
self._return_compiled = compile(self._result_var,
"return" + self._result_var, "eval")
def __init__(self, symbol):
constants, python_str = pybamm.to_python(symbol, debug=False, output_jax=True)
# replace numpy function calls to jax numpy calls
python_str = python_str.replace("np.", "jax.numpy.")
# convert all numpy constants to device vectors
for symbol_id in constants:
if isinstance(constants[symbol_id], np.ndarray):
constants[symbol_id] = jax.device_put(constants[symbol_id])
# get a list of constant arguments to input to the function
arg_list = [
id_to_python_variable(symbol_id, True) for symbol_id in constants.keys()
]
# get a list of hashable arguments to make static
# a jax device array is not hashable
static_argnums = (
i
for i, c in enumerate(constants.values())
if not (isinstance(c, jax.interpreters.xla.DeviceArray))
)
# store constants
self._constants = tuple(constants.values())
# indent code
python_str = " " + python_str
python_str = python_str.replace("\n", "\n ")
# add function def to first line
args = "t=None, y=None, y_dot=None, inputs=None, known_evals=None"
if arg_list:
args = ",".join(arg_list) + ", " + args
python_str = "def evaluate_jax({}):\n".format(args) + python_str
# calculate the final variable that will output the result of calling `evaluate`
# on `symbol`
result_var = id_to_python_variable(symbol.id, symbol.is_constant())
if symbol.is_constant():
result_value = symbol.evaluate()
# add return line
if symbol.is_constant() and isinstance(result_value, numbers.Number):
python_str = python_str + "\n return " + str(result_value)
else:
python_str = python_str + "\n return " + result_var
# store a copy of examine_jaxpr
python_str = python_str + "\nself._evaluate_jax = evaluate_jax"
# store the final generated code
self._python_str = python_str
# compile and run the generated python code,
compiled_function = compile(python_str, result_var, "exec")
exec(compiled_function)
n = len(arg_list)
static_argnums = tuple(static_argnums)
self._jit_evaluate = jax.jit(self._evaluate_jax, static_argnums=static_argnums)
# store a jit version of evaluate_jax's jacobian
jacobian_evaluate = jax.jacfwd(self._evaluate_jax, argnums=1 + n)
self._jac_evaluate = jax.jit(jacobian_evaluate, static_argnums=static_argnums)