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ast.py
445 lines (300 loc) · 11.4 KB
/
ast.py
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from enum import Enum
from inspect import getmembers, isclass
from sys import modules
import numpy as np
class Expr:
output_size = 1
# Setting this value to true serves as an indication that the result
# of evaluation of this expression is being used in other expressions
# and it's recommended to persist or cache it in some way.
# The actual caching mechanism (if any) is left up to a specific
# interpreter implementation to provide.
to_reuse = False
class IdExpr(Expr):
def __init__(self, expr, to_reuse=False):
self.expr = expr
self.to_reuse = to_reuse
self.output_size = expr.output_size
def __str__(self):
return f"IdExpr({self.expr},to_reuse={self.to_reuse})"
def __eq__(self, other):
return type(other) is IdExpr and self.expr == other.expr
def __hash__(self):
return hash(self.expr)
class FeatureRef(Expr):
def __init__(self, index):
self.index = index
def __str__(self):
return f"FeatureRef({self.index})"
def __eq__(self, other):
return type(other) is FeatureRef and self.index == other.index
def __hash__(self):
return hash(self.index)
class BinExpr(Expr):
pass
# Numeric Expressions.
class NumExpr(Expr):
pass
class NumVal(NumExpr):
def __init__(self, value, dtype=np.float64):
self.value = dtype(value)
def __str__(self):
return f"NumVal({self.value})"
def __eq__(self, other):
return type(other) is NumVal and self.value == other.value
def __hash__(self):
return hash(self.value)
class AbsExpr(NumExpr):
def __init__(self, expr, to_reuse=False):
assert expr.output_size == 1, "Only scalars are supported"
self.expr = expr
self.to_reuse = to_reuse
def __str__(self):
return f"AbsExpr({self.expr},to_reuse={self.to_reuse})"
def __eq__(self, other):
return type(other) is AbsExpr and self.expr == other.expr
def __hash__(self):
return hash(self.expr)
class AtanExpr(NumExpr):
def __init__(self, expr, to_reuse=False):
assert expr.output_size == 1, "Only scalars are supported"
self.expr = expr
self.to_reuse = to_reuse
def __str__(self):
return f"AtanExpr({self.expr},to_reuse={self.to_reuse})"
def __eq__(self, other):
return type(other) is AtanExpr and self.expr == other.expr
def __hash__(self):
return hash(self.expr)
class ExpExpr(NumExpr):
def __init__(self, expr, to_reuse=False):
assert expr.output_size == 1, "Only scalars are supported"
self.expr = expr
self.to_reuse = to_reuse
def __str__(self):
return f"ExpExpr({self.expr},to_reuse={self.to_reuse})"
def __eq__(self, other):
return type(other) is ExpExpr and self.expr == other.expr
def __hash__(self):
return hash(self.expr)
class LogExpr(NumExpr):
def __init__(self, expr, to_reuse=False):
assert expr.output_size == 1, "Only scalars are supported"
self.expr = expr
self.to_reuse = to_reuse
def __str__(self):
return f"LogExpr({self.expr},to_reuse={self.to_reuse})"
def __eq__(self, other):
return type(other) is LogExpr and self.expr == other.expr
def __hash__(self):
return hash(self.expr)
class Log1pExpr(NumExpr):
def __init__(self, expr, to_reuse=False):
assert expr.output_size == 1, "Only scalars are supported"
self.expr = expr
self.to_reuse = to_reuse
def __str__(self):
return f"Log1pExpr({self.expr},to_reuse={self.to_reuse})"
def __eq__(self, other):
return type(other) is Log1pExpr and self.expr == other.expr
def __hash__(self):
return hash(self.expr)
class SqrtExpr(NumExpr):
def __init__(self, expr, to_reuse=False):
assert expr.output_size == 1, "Only scalars are supported"
self.expr = expr
self.to_reuse = to_reuse
def __str__(self):
return f"SqrtExpr({self.expr},to_reuse={self.to_reuse})"
def __eq__(self, other):
return type(other) is SqrtExpr and self.expr == other.expr
def __hash__(self):
return hash(self.expr)
class TanhExpr(NumExpr):
def __init__(self, expr, to_reuse=False):
assert expr.output_size == 1, "Only scalars are supported"
self.expr = expr
self.to_reuse = to_reuse
def __str__(self):
return f"TanhExpr({self.expr},to_reuse={self.to_reuse})"
def __eq__(self, other):
return type(other) is TanhExpr and self.expr == other.expr
def __hash__(self):
return hash(self.expr)
class PowExpr(NumExpr):
def __init__(self, base_expr, exp_expr, to_reuse=False):
assert base_expr.output_size == 1, "Only scalars are supported"
assert exp_expr.output_size == 1, "Only scalars are supported"
self.base_expr = base_expr
self.exp_expr = exp_expr
self.to_reuse = to_reuse
def __str__(self):
return (f"PowExpr({self.base_expr},{self.exp_expr},"
f"to_reuse={self.to_reuse})")
def __eq__(self, other):
return (type(other) is PowExpr and
self.base_expr == other.base_expr and
self.exp_expr == other.exp_expr)
def __hash__(self):
return hash((self.base_expr, self.exp_expr))
class BinNumOpType(Enum):
ADD = '+'
SUB = '-'
MUL = '*'
DIV = '/'
class BinNumExpr(NumExpr, BinExpr):
def __init__(self, left, right, op, to_reuse=False):
assert left.output_size == 1, "Only scalars are supported"
assert right.output_size == 1, "Only scalars are supported"
self.left = left
self.right = right
self.op = op
self.to_reuse = to_reuse
def __str__(self):
return (f"BinNumExpr({self.left},{self.right},{self.op.name},"
f"to_reuse={self.to_reuse})")
def __eq__(self, other):
return _eq_bin_exprs(self, other, type(self))
def __hash__(self):
return hash((self.left, self.right, self.op))
# Vector Expressions.
class VectorExpr(Expr):
pass
class VectorVal(VectorExpr):
def __init__(self, exprs):
assert all(e.output_size == 1 for e in exprs), (
"All expressions for VectorVal must be scalar")
self.exprs = exprs
self.output_size = len(exprs)
def __str__(self):
args = ",".join([str(e) for e in self.exprs])
return f"VectorVal([{args}])"
def __eq__(self, other):
return (type(other) is VectorVal and
self.output_size == other.output_size and
all(i == j for i, j in zip(self.exprs, other.exprs)))
def __hash__(self):
return hash(tuple(self.exprs))
class SoftmaxExpr(VectorExpr):
def __init__(self, exprs, to_reuse=False):
assert all(e.output_size == 1 for e in exprs), (
"All expressions for SoftmaxExpr must be scalar")
self.exprs = exprs
self.to_reuse = to_reuse
self.output_size = len(exprs)
def __str__(self):
args = ",".join([str(e) for e in self.exprs])
return f"SoftmaxExpr({args},to_reuse={self.to_reuse})"
def __eq__(self, other):
return (type(other) is SoftmaxExpr and
self.output_size == other.output_size and
all(i == j for i, j in zip(self.exprs, other.exprs)))
def __hash__(self):
return hash(tuple(self.exprs))
class BinVectorExpr(VectorExpr, BinExpr):
def __init__(self, left, right, op):
assert left.output_size > 1, "Only vectors are supported"
assert left.output_size == right.output_size, (
"Vectors must be of the same size")
self.left = left
self.right = right
self.op = op
self.output_size = left.output_size
def __str__(self):
return f"BinVectorExpr({self.left},{self.right},{self.op.name})"
def __eq__(self, other):
return _eq_bin_exprs(self, other, type(self))
def __hash__(self):
return hash((self.left, self.right, self.op))
class BinVectorNumExpr(VectorExpr, BinExpr):
def __init__(self, left, right, op):
assert left.output_size > 1, "Only vectors are supported"
assert right.output_size == 1, "Only scalars are supported"
self.left = left
self.right = right
self.op = op
self.output_size = left.output_size
def __str__(self):
return f"BinVectorNumExpr({self.left},{self.right},{self.op.name})"
def __eq__(self, other):
return _eq_bin_exprs(self, other, type(self))
def __hash__(self):
return hash((self.left, self.right, self.op))
# Boolean Expressions.
class BoolExpr(Expr):
pass
class CompOpType(Enum):
GT = '>'
GTE = '>='
LT = '<'
LTE = '<='
EQ = '=='
NOT_EQ = '!='
@staticmethod
def from_str_op(op):
return COMP_OP_TYPE_MAPPING[op]
COMP_OP_TYPE_MAPPING = {e.value: e for e in CompOpType}
class CompExpr(BoolExpr):
def __init__(self, left, right, op):
assert left.output_size == 1, "Only scalars are supported"
assert right.output_size == 1, "Only scalars are supported"
self.left = left
self.right = right
self.op = op
def __str__(self):
return f"CompExpr({self.left},{self.right},{self.op.name})"
def __eq__(self, other):
return _eq_bin_exprs(self, other, type(self))
def __hash__(self):
return hash((self.left, self.right, self.op))
# Control Expressions.
class CtrlExpr(Expr):
size = None
class IfExpr(CtrlExpr):
def __init__(self, test, body, orelse):
assert body.output_size == orelse.output_size, (
"body and orelse expressions should have the same output size")
self.test = test
self.body = body
self.orelse = orelse
self.output_size = body.output_size
def __str__(self):
return f"IfExpr({self.test},{self.body},{self.orelse})"
def __eq__(self, other):
return (type(other) is IfExpr and
self.test == other.test and
self.body == other.body and
self.orelse == other.orelse)
def __hash__(self):
return hash((self.test, self.body, self.orelse))
TOTAL_NUMBER_OF_EXPRESSIONS = len(getmembers(modules[__name__], isclass))
NESTED_EXPRS_MAPPINGS = [
((BinExpr, CompExpr), lambda e: [e.left, e.right]),
((PowExpr), lambda e: [e.base_expr, e.exp_expr]),
((VectorVal, SoftmaxExpr), lambda e: e.exprs),
((IfExpr), lambda e: [e.test, e.body, e.orelse]),
((AbsExpr, AtanExpr, ExpExpr, IdExpr, LogExpr, Log1pExpr,
SqrtExpr, TanhExpr),
lambda e: [e.expr]),
]
def count_exprs(expr, exclude_list=None):
expr_type = type(expr)
excluded = tuple(exclude_list) if exclude_list else ()
init = 1
if issubclass(expr_type, excluded):
init = 0
if isinstance(expr, (NumVal, FeatureRef)):
return init
for tpes, nested_f in NESTED_EXPRS_MAPPINGS:
if issubclass(expr_type, tpes):
return init + sum(map(
lambda e: count_exprs(e, exclude_list),
nested_f(expr)))
expr_type_name = expr_type.__name__
raise ValueError(f"Unexpected expression type '{expr_type_name}'")
def _eq_bin_exprs(expr_one, expr_two, expected_type):
return (type(expr_one) is expected_type and
type(expr_two) is expected_type and
expr_one.left == expr_two.left and
expr_one.right == expr_two.right and
expr_one.op == expr_two.op)