mirror of https://github.com/llvm/torch-mlir
Implement __array_func__ hook and use it to trace np.dot.
* Creates an abstraction/registry around emitters (intended to generalize to AST compilation as well). * Reworks ufuncs to use the same mechanism as array funcs. * Adds the numpy.dot op.pull/1/head
Stella Laurenzo
parent
1f54838d2e
commit
a5f755d406
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@ -13,6 +13,32 @@ include "NumpyDialect.td"
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include "mlir/Interfaces/SideEffects.td"
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include "mlir/IR/SymbolInterfaces.td"
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//----------------------------------------------------------------------------//
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// IR casting and conversions
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//----------------------------------------------------------------------------//
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def Numpy_NarrowOp : Numpy_Op<"narrow", []> {
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let summary = "Narrows an array to a known type at boundaries.";
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let description = [{
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During tracing, specific data types are often unknown. This op generically
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narrows from an unknown to a known data type at boundaries.
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}];
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let arguments = (ins
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Numpy_AnyArray:$operand
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);
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let results = (outs
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Numpy_AnyArray:$result
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);
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let assemblyFormat = [{
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$operand attr-dict `:` functional-type($operand, $result)
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}];
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}
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//----------------------------------------------------------------------------//
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// Universal function ops (ufunc)
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// See: https://docs.scipy.org/doc/numpy/reference/ufuncs.html
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//----------------------------------------------------------------------------//
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def Numpy_BuiltinUfuncOp : Numpy_Op<"builtin_ufunc", [Symbol]> {
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let summary = "References a built-in universal function";
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let description = [{
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@ -69,20 +95,37 @@ def Numpy_UfuncCallOp : Numpy_Op<"ufunc_call", []> {
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}];
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}
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def Numpy_Narrow : Numpy_Op<"narrow", []> {
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let summary = "Narrows an array to a known type at boundaries.";
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//----------------------------------------------------------------------------//
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// Built-in array functions
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//
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// These are ops that mirror supported array functions in numpy or related
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// libraries. Note that there is some evolution happening on the dispatch
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// mechanism for these.
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// See: https://numpy.org/neps/nep-0018-array-function-protocol.html
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// See: https://numpy.org/neps/nep-0037-array-module.html
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//
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// Note that operators are in general free to take any arguments, but there
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// are some conventions that are mirrored here:
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//
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// - `out` arguments indicate that the operation should perform a mutation
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// of a specific array. This is not modeled at the individual op level,
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// instead producing IR constructs to map the intent.
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//----------------------------------------------------------------------------//
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def Numpy_DotOp : Numpy_Op<"dot", []> {
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let summary = "Represents the `numpy.dot` operator";
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let description = [{
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During tracing, specific data types are often unknown. This op generically
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narrows from an unknown to a known data type at boundaries.
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See: https://numpy.org/doc/stable/reference/generated/numpy.dot.html
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}];
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let arguments = (ins
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Numpy_AnyArray:$operand
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Numpy_AnyArray:$a,
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Numpy_AnyArray:$b
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);
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let results = (outs
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Numpy_AnyArray:$result
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Numpy_AnyArray:$output
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);
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let assemblyFormat = [{
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$operand attr-dict `:` functional-type($operand, $result)
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operands attr-dict `:` functional-type(operands, $output)
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}];
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}
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@ -0,0 +1,4 @@
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[style]
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based_on_style = google
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column_limit = 80
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indent_width = 2
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@ -104,7 +104,7 @@ _BUILTIN_MODULE_ASM = r"""
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numpy.ufunc_return %0 : f32
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}
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)
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numpy.generic_ufunc @numpy.multiple (
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numpy.generic_ufunc @numpy.multiply (
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overload(%arg0: i32, %arg1: i32) -> i32 {
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%0 = muli %arg0, %arg1 : i32
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numpy.ufunc_return %0 : i32
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@ -0,0 +1,270 @@
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# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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# See https://llvm.org/LICENSE.txt for license information.
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# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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import numpy as np
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from collections import namedtuple
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from enum import Enum
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class Protocol(Enum):
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UFUNC = 1
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ARRAY_FUNC = 2
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class TraceValueType(Enum):
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NDARRAY = 1
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class TraceValue(
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namedtuple("TraceValue", ["value", "type"],
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defaults=(TraceValueType.NDARRAY,))):
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__slots__ = ()
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"""A Python value and the trace type that it should correspond to."""
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class TraceInvocation(
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namedtuple("TraceInvocation", ["inputs", "kwargs", "protocol", "method"],
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defaults=(Protocol.ARRAY_FUNC, "__call__"))):
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"""An invocation of a single functions.
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This abstracts over both ufuncs and array_funcs, differentiating by the
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protocol and method.
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"""
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__slots__ = ()
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class EmissionRequest(
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namedtuple("EmissionRequest", ["input_ssa_values", "ops", "types", "extra"],
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defaults=(None,))):
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"""Represents the result of processing inputs from an invocation.
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The `input_ssa_values` are mlir.ir.Value instances corresponding to
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input_trace_values in TraceValueMap.
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The `extra` value is only relevant to the producer and can be used as a
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blackbox mechanism to transfer un-tracked state from an invocation to
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emission.
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The `ops` and `types` fields correspond to mlir.ir.Ops and mlir.ir.Types
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instances respectively.
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"""
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__slots__ = ()
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class TraceValueMap(
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namedtuple("TraceValueMap",
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["input_trace_values", "result_trace_value_types", "extra"],
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defaults=(None,))):
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"""The result of mapping an invocation to corresponding op structure.
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This type associates:
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- Python (object, TraceValueType) representing invocation inputs that
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correspond to SSA values in the IR.
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- TraceValueTypes that are the expected logical result types from the
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invocation.
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- 'extra' object that is passed to followon Emitter methods.
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"""
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__slots__ = ()
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class FuncEmitter:
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"""An emitter for an op-like function invocation."""
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def map_invocation(self, trace_invocation: TraceInvocation) -> TraceValueMap:
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"""Maps from an invocation to EmissionRequest.
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This hook is also responsible for validating the invocation and should
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raise appropriate user-visible exceptions (i.e. when invoked with incorrect
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arguments).
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This hook is used to prepare for emission in a define-by-run scenario.
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Static emission from an AST needs to be prepared via another mechanism.
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Args:
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trace_invocation: An Invocation instance to map.
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Returns:
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A TraceValueMap describing the structure of the invocation as mapped
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to/from IR.
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"""
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raise NotImplementedError()
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def map_results(self, py_results, extra):
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"""Maps a list of python results to actual function return values.
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Args:
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py_results: List of python results corresponding to the emitted op
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results.
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extra: The extra object returned by map_invocation.
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Returns:
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Actual function result. Typically this requires special handling to
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unpack the result of functions that return 1 item.
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"""
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raise NotImplementedError()
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def emit(self, request: EmissionRequest):
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"""Emits IR using the provided ops and types factories.
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Args:
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emission_inputs: An EmissionRequest produced by tracing each TraceValue
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from a previous call to map_invocation and the corresponding extra
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value.
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Returns:
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An iterable of mlir.ir.Value instances representing the outputs of the
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operation. The `builder` on `ops` must be positioned to consume these
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values.
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"""
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raise NotImplementedError()
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class GenericCallUfuncEmitter(FuncEmitter):
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"""A FuncEmitter for generic ufuncs requiring no special behavior.
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Representation:
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>>> emitter = GenericCallUfuncEmitter("numpy.add")
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>>> emitter
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<ufunc emitter 'numpy.add'>
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>>> inv = TraceInvocation([1, 2], {}, protocol=Protocol.UFUNC)
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>>> inputs = emitter.map_invocation(inv)
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>>> inputs
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TraceValueMap(input_trace_values=[TraceValue(value=1, type=<TraceValueType.NDARRAY: 1>), TraceValue(value=2, type=<TraceValueType.NDARRAY: 1>)], result_trace_value_types=[<TraceValueType.NDARRAY: 1>], extra=None)
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Error on unsupported kwargs:
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>>> inv = TraceInvocation([1, 2], {"foobar": 1}, protocol=Protocol.UFUNC)
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>>> emitter.map_invocation(inv)
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Traceback (most recent call last):
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...
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ValueError: Unexpected keyword args for ufunc numpy.add: foobar
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"""
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__slots__ = ("_ufunc_name")
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def __init__(self, ufunc_name: str):
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self._ufunc_name = ufunc_name
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def __repr__(self):
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return "<ufunc emitter '%s'>" % self._ufunc_name
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def map_invocation(self,
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trace_invocation: TraceInvocation) -> EmissionRequest:
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assert trace_invocation.protocol == Protocol.UFUNC
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assert trace_invocation.method == "__call__"
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if trace_invocation.kwargs:
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raise ValueError(
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"Unexpected keyword args for ufunc %s: %s" %
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(self._ufunc_name, ", ".join(trace_invocation.kwargs.keys())))
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# Without above special cases, any positional args map to emission
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# inputs.
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return TraceValueMap([
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TraceValue(i, TraceValueType.NDARRAY) for i in trace_invocation.inputs
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], [TraceValueType.NDARRAY],
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extra=None)
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def map_results(self, py_results, extra):
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# Ufuncs always return one result, so just unpack it.
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return py_results[0]
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def emit(self, request: EmissionRequest):
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op_result_type = request.types.tensor(request.types.numpy_any_dtype)
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call_op = request.ops.numpy_ufunc_call_op(self._ufunc_name, op_result_type,
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*request.input_ssa_values)
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return call_op.results
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class GenericArrayFuncEmitter(FuncEmitter):
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"""Emitter for array funcs that don't do anything 'special'."""
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__slots__ = ("_op_name", "_nresults")
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def __init__(self, op_name: str, nresults: int = 1):
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self._op_name = op_name
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self._nresults = nresults
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def __repr__(self):
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return "<array_func emitter '%s'>" % self._op_name
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def map_invocation(self,
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trace_invocation: TraceInvocation) -> EmissionRequest:
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assert trace_invocation.protocol == Protocol.ARRAY_FUNC
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if trace_invocation.method != "__call__":
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raise NotImplementedError("Only __call__ is supported for %s (got '%s')" %
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(
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self._op_name,
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trace_invocation.method,
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))
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if trace_invocation.kwargs:
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raise ValueError(
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"Unexpected keyword args for %s: %s" %
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(self._op_name, ", ".join(trace_invocation.kwargs.keys())))
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# Without above special cases, any positional args map to emission
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# inputs.
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return TraceValueMap([
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TraceValue(i, TraceValueType.NDARRAY) for i in trace_invocation.inputs
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], [TraceValueType.NDARRAY] * self._nresults,
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extra=None)
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def map_results(self, py_results, extra):
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if self._nresults == 1:
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return py_results[0]
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else:
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return tuple(py_results)
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def emit(self, request: EmissionRequest):
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op_result_types = [request.types.tensor(request.types.numpy_any_dtype)
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] * self._nresults
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op = request.ops.op(self._op_name, op_result_types,
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request.input_ssa_values)
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return op.results
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class EmitterRegistry:
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"""Registry of known Emitter instances mapped to source function.
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>>> r = EmitterRegistry.create_default()
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>>> r.lookup_ufunc(np.add, "__call__")
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<ufunc emitter 'numpy.add'>
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>>> r.lookup_array_func(np.dot)
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<array_func emitter 'numpy.dot'>
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"""
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def __init__(self):
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self._ufunc_map = {} # Dictionary of (f, method) -> Emitter
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self._arrayfunc_map = {} # Dictionary of f -> Emitter
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@classmethod
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def create_default(cls):
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registry = cls()
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registry.register_defaults()
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return registry
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def register_ufunc(self, ufunc, method, emitter):
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# Last registration wins.
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self._ufunc_map[(ufunc, method)] = emitter
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def register_array_func(self, f, emitter):
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# Last registration wins.
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self._arrayfunc_map[f] = emitter
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def lookup_ufunc(self, ufunc, method):
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return self._ufunc_map.get((ufunc, method))
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def lookup_array_func(self, f):
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return self._arrayfunc_map.get(f)
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def register_defaults(self):
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# Find all ufuncs in the numpy module and register by name.
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for member in sorted(dir(np)):
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ufunc = getattr(np, member)
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if isinstance(ufunc, np.ufunc):
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self.register_ufunc(ufunc, "__call__",
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GenericCallUfuncEmitter("numpy." + member))
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# Register generic 1-result array funcs.
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for f, op_name in ((np.inner, "numpy.inner"), (np.outer, "numpy.outer"),
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(np.dot, "numpy.dot"), (np.vdot, "numpy.vdot"),
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(np.linalg.det, "numpy.linalg.det")):
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self.register_array_func(f, GenericArrayFuncEmitter(op_name))
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if __name__ == "__main__":
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import doctest
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doctest.testmod()
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@ -3,26 +3,30 @@
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# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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import re
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from typing import Iterable
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import numpy as np
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from ..dialect import Numpy
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from ..native.mlir import ir
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from .context import *
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from .emitters import *
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from ..exporter import *
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from ..types import *
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class ModuleBuilder:
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"""Builds an MLIR module by tracing functions."""
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def __init__(self, mlir_context=None):
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self.context = context if mlir_context else ir.MLIRContext()
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def __init__(self, mlir_context=None, emitter_registry=None):
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self.context = mlir_context if mlir_context else ir.MLIRContext()
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# TODO: Instead of bootstrapping a large module, populate imports
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# dynamically.
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self.module = Numpy.load_builtin_module(self.context)
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self.ops = Numpy.Ops(self.context)
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self.types = Numpy.Types(self.context)
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self.emitters = (emitter_registry
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if emitter_registry else EmitterRegistry.create_default())
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def trace(self, export_py_func: ExportPyFunction):
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"""Traces and exported python function."""
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@ -49,6 +53,7 @@ class FunctionTracer(TraceContext):
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"_traced_arrays",
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"_types",
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]
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def __init__(self, module_builder: ModuleBuilder, epf: ExportPyFunction):
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super().__init__(desc="[trace of %s]" % epf.__name__)
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self.module_builder = module_builder
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@ -65,7 +70,8 @@ class FunctionTracer(TraceContext):
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# Extract ArrayParams for all args and results.
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self._args_array_params = [
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ArrayParams.from_constraints(arg.constraints)
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for arg in self.epf.sig.args]
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for arg in self.epf.sig.args
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]
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self._python_args = [None] * len(self._args_array_params)
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self._result_array_params = ArrayParams.from_constraints(
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self.epf.sig.result.constraints)
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@ -82,9 +88,10 @@ class FunctionTracer(TraceContext):
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ops = self._ops
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py_results = (self.epf.pyfunc(*self._python_args),)
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if len(py_results) != len(self._f_types):
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raise TracingError(
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"Traced function returned != %d results: %r" % (
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len(self._f_types), py_results,))
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raise TracingError("Traced function returned != %d results: %r" % (
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len(self._f_types),
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py_results,
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))
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# Narrow all results to the declared return types.
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return_operands = []
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@ -106,12 +113,12 @@ class FunctionTracer(TraceContext):
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return self._traced_arrays.get(traced_array)
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def _validate(self):
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if not all(arg.type_class == TypeClass.NdArray
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for arg in self.epf.sig.args):
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if not all(
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arg.type_class == TypeClass.NdArray for arg in self.epf.sig.args):
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raise NotImplementedError("Non NdArray args: %r" % (self.epf.sig.args,))
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if not self.epf.sig.result.type_class == TypeClass.NdArray:
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raise NotImplementedError("Non NdArray result: %r" % (
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self.epf.sig.result,))
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raise NotImplementedError("Non NdArray result: %r" %
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(self.epf.sig.result,))
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def _create_mlir_function(self):
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mlir_c = self._mlir_c
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@ -119,10 +126,13 @@ class FunctionTracer(TraceContext):
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ops = self._ops
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types = self._types
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epf = self.epf
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f_args = [mlir_c.parse_type(ap.mlir_tensor_type_asm)
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for ap in self._args_array_params]
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f_types = [mlir_c.parse_type(
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self._result_array_params.mlir_tensor_type_asm)]
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f_args = [
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mlir_c.parse_type(ap.mlir_tensor_type_asm)
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for ap in self._args_array_params
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]
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f_types = [
|
||||
mlir_c.parse_type(self._result_array_params.mlir_tensor_type_asm)
|
||||
]
|
||||
ops.builder.insert_before_terminator(mlir_m.first_block)
|
||||
f_type = types.function(f_args, f_types)
|
||||
f = ops.func_op(epf.__name__, f_type, create_entry_block=True)
|
||||
|
|
@ -136,54 +146,59 @@ class FunctionTracer(TraceContext):
|
|||
self.set_traced_array(ta, entry_block.args[index])
|
||||
self._python_args[index] = ta
|
||||
|
||||
def _resolve_input_ssa_values(self, trace_values: Iterable[TraceValue]):
|
||||
"""Resolves input python values to SSA values."""
|
||||
ssa_values = []
|
||||
for tv in trace_values:
|
||||
assert tv.type == TraceValueType.NDARRAY, (
|
||||
"Unsupported TraceValueType: %r" % tv.type)
|
||||
ssa_value = self.get_traced_array_value(tv.value)
|
||||
if ssa_value is None:
|
||||
raise TracingError(
|
||||
"Required a traced python NDARRAY but not found: %r" % (tv,))
|
||||
ssa_values.append(ssa_value)
|
||||
return ssa_values
|
||||
|
||||
def _resolve_result_py_values(self,
|
||||
trace_value_types: Iterable[TraceValueType],
|
||||
ssa_values):
|
||||
"""Resolves result SSA values to runtime python values."""
|
||||
assert len(trace_value_types) == len(ssa_values), (
|
||||
"Mismatched emitter declared result types and results")
|
||||
py_values = []
|
||||
for trace_value_type, ssa_value in zip(trace_value_types, ssa_values):
|
||||
assert trace_value_type == TraceValueType.NDARRAY, (
|
||||
"Unsupported TraceValueType: %r" % trace_value_type)
|
||||
py_value = TracedArray(self)
|
||||
self.set_traced_array(py_value, ssa_value)
|
||||
py_values.append(py_value)
|
||||
return py_values
|
||||
|
||||
def _emit_invocation(self, emitter: FuncEmitter, invocation: TraceInvocation):
|
||||
tv_map = emitter.map_invocation(invocation)
|
||||
input_ssa_values = self._resolve_input_ssa_values(tv_map.input_trace_values)
|
||||
request = EmissionRequest(input_ssa_values,
|
||||
ops=self._ops,
|
||||
types=self._types,
|
||||
extra=tv_map.extra)
|
||||
result_ssa_values = emitter.emit(request)
|
||||
py_values = self._resolve_result_py_values(tv_map.result_trace_value_types,
|
||||
result_ssa_values)
|
||||
return emitter.map_results(py_values, tv_map.extra)
|
||||
|
||||
def _handle_ufunc(self, ufunc, method, inputs, kwargs):
|
||||
if method == "__call__":
|
||||
if kwargs:
|
||||
raise TracingError("Generic ufunc with kwargs not supported %r" % (
|
||||
ufunc,))
|
||||
emitter = self.module_builder.emitters.lookup_ufunc(ufunc, method)
|
||||
if not emitter:
|
||||
return NotImplemented
|
||||
invocation = TraceInvocation(inputs, kwargs, Protocol.UFUNC, method)
|
||||
return self._emit_invocation(emitter, invocation)
|
||||
|
||||
# Map inputs to TracedArrays.
|
||||
# TODO: Process captures, promotions, etc.
|
||||
op_inputs = []
|
||||
for py_input in inputs:
|
||||
if not isinstance(py_input, TracedArray):
|
||||
raise TracingError("Unsupported ufunc input: %r", (py_input,))
|
||||
op_input = self.get_traced_array_value(py_input)
|
||||
if op_input is None:
|
||||
raise TracingError("Unregistered traced array: %r", (py_input,))
|
||||
op_inputs.append(op_input)
|
||||
|
||||
# Emit op.
|
||||
types = self._types
|
||||
mlir_m = self._mlir_m
|
||||
callee_symbol = _UFUNC_SYMBOL_MAP.get(ufunc)
|
||||
if not callee_symbol:
|
||||
raise TracingError("Unsupported ufunc: %r" % ufunc)
|
||||
op_result_type = types.tensor(types.numpy_any_dtype)
|
||||
call_op = self._ops.numpy_ufunc_call_op(
|
||||
callee_symbol, op_result_type, *op_inputs)
|
||||
op_result = call_op.results[0]
|
||||
|
||||
# Wrap returns.
|
||||
return_array = TracedArray(self)
|
||||
self.set_traced_array(return_array, op_result)
|
||||
return return_array
|
||||
|
||||
# Unsupported method.
|
||||
raise TracingError("Unsupported ufunc method %r:%r" % (ufunc, method,))
|
||||
|
||||
|
||||
# TODO: There should be an open registry of ufuncs. But for now, just map
|
||||
# introspect the numpy package and record them.
|
||||
def _build_ufunc_symbol_map():
|
||||
d = {}
|
||||
for member in dir(np):
|
||||
ufunc = getattr(np, member)
|
||||
if isinstance(ufunc, np.ufunc):
|
||||
d[ufunc] = "numpy." + member
|
||||
return d
|
||||
|
||||
_UFUNC_SYMBOL_MAP = _build_ufunc_symbol_map()
|
||||
def _handle_array_func(self, func, types, inputs, kwargs):
|
||||
emitter = self.module_builder.emitters.lookup_array_func(func)
|
||||
if not emitter:
|
||||
return NotImplemented
|
||||
invocation = TraceInvocation(inputs, kwargs, Protocol.ARRAY_FUNC)
|
||||
return self._emit_invocation(emitter, invocation)
|
||||
|
||||
|
||||
if __name__ == "__main__":
|
||||
|
|
|
|||
Loading…
Reference in New Issue