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cbe524298c
This allows lowering of threefry2x32 for GPU even on a machine without GPUs. For the next 3 weeks, we only use the new custom call implementation if we are not in "export" mode, and if we use a new jaxlib. PiperOrigin-RevId: 647657084
134 lines
4.6 KiB
Python
134 lines
4.6 KiB
Python
# Copyright 2019 The JAX Authors.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# https://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from __future__ import annotations
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import functools
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from functools import partial
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import importlib
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import itertools
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import operator
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import jaxlib.mlir.ir as ir
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from jaxlib import xla_client
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from .hlo_helpers import custom_call
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from .gpu_common_utils import GpuLibNotLinkedError
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for cuda_module_name in [".cuda", "jax_cuda12_plugin"]:
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try:
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_cuda_prng = importlib.import_module(
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f"{cuda_module_name}._prng", package="jaxlib"
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)
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except ImportError:
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_cuda_prng = None
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else:
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break
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if _cuda_prng:
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for _name, _value in _cuda_prng.registrations().items():
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# TODO(b/338022728): remove after 6 months, always api_version=1
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api_version = 1 if "_ffi" in _name else 0
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xla_client.register_custom_call_target(_name, _value, platform="CUDA",
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api_version=api_version)
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for rocm_module_name in [".rocm", "jax_rocm60_plugin"]:
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try:
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_hip_prng = importlib.import_module(
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f"{rocm_module_name}._prng", package="jaxlib"
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)
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except ImportError:
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_hip_prng = None
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else:
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break
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if _hip_prng:
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for _name, _value in _hip_prng.registrations().items():
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# TODO(b/338022728): remove after 6 months, always api_version=1
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api_version = 1 if "_ffi" in _name else 0
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xla_client.register_custom_call_target(_name, _value, platform="ROCM",
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api_version=api_version)
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_prod = lambda xs: functools.reduce(operator.mul, xs, 1)
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# TODO(b/338022728): forward_compatibility_mode=False after 3 weeks.
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def _threefry2x32_lowering(prng, platform: str, keys, data,
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length: int | ir.Value | None = None,
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output_shape: ir.Value | None = None,
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forward_compatibility_mode: bool = True):
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"""ThreeFry2x32 kernel for GPU.
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In presence of dynamic shapes, `length` is an `ir.Value` and `output_shape`
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is a 1D tensor describing the shape of the two outputs.
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"""
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if forward_compatibility_mode and not prng:
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raise GpuLibNotLinkedError()
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assert len(keys) == 2, keys
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assert len(data) == 2, data
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assert (ir.RankedTensorType(keys[0].type).element_type ==
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ir.IntegerType.get_unsigned(32)), keys[0].type
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typ = keys[0].type
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dims = ir.RankedTensorType(typ).shape
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for x in itertools.chain(keys, data):
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assert x.type == typ, (x.type, typ)
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ndims = len(dims)
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layout = tuple(range(ndims - 1, -1, -1))
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operand_layouts = [layout] * 4
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operands = [keys[0], keys[1], data[0], data[1]]
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if forward_compatibility_mode and length is None:
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length = _prod(dims)
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opaque = {} # Use if not forward_compatibility_mode to trigger the FFI (v4).
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if isinstance(length, int):
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if forward_compatibility_mode:
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opaque = prng.threefry2x32_descriptor(length)
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result_shapes = None
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else:
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assert output_shape is not None
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if forward_compatibility_mode:
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opaque = prng.threefry2x32_descriptor(-1)
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assert (ir.RankedTensorType(length.type).element_type == # type: ignore[attribute-error]
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ir.IntegerType.get_signless(64)), length
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assert (ir.RankedTensorType(length.type).shape == # type: ignore[attribute-error]
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[1]), (length, ir.RankedTensorType(length.type).shape) # type: ignore[attribute-error]
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# Pass the length, which will be used by the custom call target since the
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# static length in the descriptor is -1.
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operands.append(length)
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operand_layouts.append((0,))
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# We also need to pass separately the shapes of the outputs.
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result_shapes = [output_shape, output_shape]
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custom_call_target = (
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f"{platform}_threefry2x32"
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if forward_compatibility_mode
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else f"{platform}_threefry2x32_ffi"
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)
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return custom_call(
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custom_call_target,
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api_version=(2 if forward_compatibility_mode else 4),
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result_types=[typ, typ],
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operands=operands,
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backend_config=opaque,
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operand_layouts=operand_layouts,
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result_layouts=[layout] * 2,
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result_shapes=result_shapes).results
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cuda_threefry2x32 = partial(_threefry2x32_lowering, _cuda_prng, "cu")
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rocm_threefry2x32 = partial(_threefry2x32_lowering, _hip_prng, "hip")
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