def _emit_lowering_rule_as_fun(lowering_rule,
ctx: LoweringRuleContext) -> builtin.FuncOp:
"""Emits the contents of a lowering rule as a private function."""
input_types = map(aval_to_ir_types, ctx.avals_in)
output_types = map(aval_to_ir_types, ctx.avals_out)
flat_input_types = util.flatten(input_types)
flat_output_types = util.flatten(output_types)
ftype = ir.FunctionType.get(flat_input_types, flat_output_types)
assert ctx.primitive is not None
func_op = builtin.FuncOp(ctx.primitive.name, ftype, ip=ctx.module_context.ip)
func_op.attributes["sym_visibility"] = ir.StringAttr.get("private")
ctx.module_context.symbol_table.insert(func_op)
entry_block = func_op.add_entry_block()
with ir.InsertionPoint(entry_block):
unflattened_args = util.unflatten(entry_block.arguments,
map(len, input_types))
outs = lowering_rule(ctx, *_unwrap_singleton_ir_values(unflattened_args))
std.ReturnOp(util.flatten(map(wrap_singleton_ir_values, outs)))
return func_op
def lower_jaxpr_to_fun(ctx: LoweringContext,
name: str,
jaxpr: core.ClosedJaxpr,
*,
public: bool = False,
replace_units_with_dummy: bool = False,
replace_tokens_with_dummy: bool = False) -> str:
"""Lowers jaxpr and its callees to an IR function.
Assumes that an MLIR context, location, and insertion point are set.
Args:
ctx: the lowering context.
name: the function name. The name will be uniquified by the symbol table,
so it is ok to use the same name multiple times.
jaxpr: the jaxpr to lower.
public: if true, the function's visibility is set to "public".
replace_units_with_dummy: if true, unit arguments/return values are
replaced with bool arrays of size [0].
replace_tokens_with_dummy: if true, token arguments/return values are
replaced with bool arrays of size [0].
Returns the name of the function.
"""
def aval_to_types(aval):
if replace_units_with_dummy and aval is core.abstract_unit:
aval = core.ShapedArray((), np.dtype(np.bool_))
elif replace_tokens_with_dummy and aval is core.abstract_token:
aval = core.ShapedArray((), np.dtype(np.bool_))
return aval_to_ir_types(aval)
input_types = map(aval_to_types, jaxpr.in_avals)
output_types = map(aval_to_types, jaxpr.out_avals)
flat_input_types = util.flatten(input_types)
flat_output_types = util.flatten(output_types)
ftype = ir.FunctionType.get(flat_input_types, flat_output_types)
func_op = builtin.FuncOp(name, ftype, ip=ctx.ip)
func_op.attributes["sym_visibility"] = ir.StringAttr.get(
"public" if public else "private")
symbol_name = ir.StringAttr(ctx.symbol_table.insert(func_op)).value
entry_block = func_op.add_entry_block()
with ir.InsertionPoint(entry_block):
unflattened_args = util.unflatten(entry_block.arguments,
map(len, input_types))
args: List[List[ir.Value]] = []
for aval, arg in zip(jaxpr.in_avals, unflattened_args):
if replace_units_with_dummy and aval is core.abstract_unit:
args.append([])
elif replace_tokens_with_dummy and aval is core.abstract_token:
args.append(mhlo.CreateTokenOp(mhlo.TokenType.get()).results)
else:
args.append(arg)
callee_name_stack = xla.extend_name_stack(ctx.name_stack,
xla.wrap_name(name, 'jit'))
out_vals = jaxpr_subcomp(ctx.replace(name_stack=callee_name_stack),
jaxpr.jaxpr, map(ir_constants,
jaxpr.consts), *args)
outs = []
for aval, out in zip(jaxpr.out_avals, out_vals):
if replace_units_with_dummy and aval is core.abstract_unit:
outs.append(ir_constants(np.zeros((), np.bool_)))
elif replace_tokens_with_dummy and aval is core.abstract_token:
outs.append(ir_constants(np.zeros((), np.bool_)))
else:
outs.append(out)
std.ReturnOp(util.flatten(outs))
return symbol_name
def lower_jaxpr_to_fun(
ctx: ModuleContext,
name: str,
jaxpr: core.ClosedJaxpr,
*,
public: bool = False,
replace_units_with_dummy: bool = False,
replace_tokens_with_dummy: bool = False,
replicated_args: Optional[Sequence[bool]] = None,
arg_shardings: Optional[Sequence[Optional[xc.OpSharding]]] = None,
result_shardings: Optional[Sequence[Optional[xc.OpSharding]]] = None,
input_output_aliases: Optional[Sequence[Optional[int]]] = None
) -> builtin.FuncOp:
"""Lowers jaxpr and its callees to an IR function.
Assumes that an MLIR context, location, and insertion point are set.
Args:
ctx: the lowering context.
name: the function name. The name will be uniquified by the symbol table,
so it is ok to use the same name multiple times.
jaxpr: the jaxpr to lower.
public: if true, the function's visibility is set to "public".
replace_units_with_dummy: if true, unit arguments/return values are
replaced with bool arrays of size [0].
replace_tokens_with_dummy: if true, token arguments/return values are
replaced with bool arrays of size [0].
replicated_args: if present, annotates arguments as replicated.
arg_shardings: sharding annotations for each argument (optional).
result_shardings: sharding annotations for each argument (optional).
input_output_aliases: optional sequence that maps argument numbers to the
corresponding output that should alias them.
Returns the name of the function.
"""
def aval_to_types(aval):
if replace_units_with_dummy and aval is core.abstract_unit:
aval = core.ShapedArray((), np.dtype(np.bool_))
elif replace_tokens_with_dummy and aval is core.abstract_token:
aval = core.ShapedArray((), np.dtype(np.bool_))
return aval_to_ir_types(aval)
input_types = map(aval_to_types, jaxpr.in_avals)
output_types = map(aval_to_types, jaxpr.out_avals)
flat_input_types = util.flatten(input_types)
flat_output_types = util.flatten(output_types)
ftype = ir.FunctionType.get(flat_input_types, flat_output_types)
func_op = builtin.FuncOp(name, ftype, ip=ctx.ip)
func_op.attributes["sym_visibility"] = ir.StringAttr.get(
"public" if public else "private")
ctx.symbol_table.insert(func_op)
if (replicated_args is not None or arg_shardings is not None
or input_output_aliases is not None):
arg_attrs: List[Dict[str, ir.Attribute]] = [
{} for _ in range(len(flat_input_types))
]
if replicated_args is not None:
replicated_ir_args = [
[replicated] * len(types)
for replicated, types in zip(replicated_args, input_types)
]
for attrs, replicated in zip(arg_attrs,
util.flatten(replicated_ir_args)):
if replicated:
attrs[
"mhlo.is_same_data_across_replicas"] = ir.UnitAttr.get(
)
if arg_shardings is not None:
ir_arg_shardings = [
[sharding] * len(types)
for sharding, types in zip(arg_shardings, input_types)
]
for attrs, sharding in zip(arg_attrs,
util.flatten(ir_arg_shardings)):
if sharding is not None:
attrs["mhlo.sharding"] = ir.StringAttr.get(
sharding.SerializeToString())
if input_output_aliases is not None:
output_ids = util.unflatten(list(range(len(flat_output_types))),
map(len, output_types))
aliases: List[Optional[int]] = []
for types, alias in zip(input_types, input_output_aliases):
if alias is None:
aliases.extend([None] * len(types))
else:
aliases.extend(output_ids[alias])
for attrs, alias in zip(arg_attrs, aliases):
if alias is not None:
attrs["tf.aliasing_output"] = i32_attr(alias)
func_op.arg_attrs = ir.ArrayAttr.get(
[ir.DictAttr.get(attrs) for attrs in arg_attrs])
if result_shardings is not None:
ir_result_shardings = util.flatten(
[[sharding] * len(types)
for sharding, types in zip(result_shardings, output_types)])
func_op.result_attrs = ir.ArrayAttr.get([
ir.DictAttr.get({} if sharding is None else {
"mhlo.sharding":
ir.StringAttr.get(sharding.SerializeToString())
}) for sharding in ir_result_shardings
])
entry_block = func_op.add_entry_block()
with ir.InsertionPoint(entry_block):
unflattened_args = util.unflatten(entry_block.arguments,
map(len, input_types))
args: List[List[ir.Value]] = []
for aval, arg in zip(jaxpr.in_avals, unflattened_args):
if replace_units_with_dummy and aval is core.abstract_unit:
args.append([])
elif replace_tokens_with_dummy and aval is core.abstract_token:
args.append(mhlo.CreateTokenOp(mhlo.TokenType.get()).results)
else:
args.append(arg)
callee_name_stack = xla.extend_name_stack(ctx.name_stack,
xla.wrap_name(name, 'jit'))
out_vals = jaxpr_subcomp(ctx.replace(name_stack=callee_name_stack),
jaxpr.jaxpr, map(ir_constants,
jaxpr.consts), *args)
outs = []
for aval, out in zip(jaxpr.out_avals, out_vals):
if replace_units_with_dummy and aval is core.abstract_unit:
outs.append(ir_constants(np.zeros((), np.bool_)))
elif replace_tokens_with_dummy and aval is core.abstract_token:
outs.append(ir_constants(np.zeros((), np.bool_)))
else:
outs.append(out)
std.ReturnOp(util.flatten(outs))
return func_op