[Core] Composable parallel: Phase 1 strategy overlay (TP/DP/stage-replica) (RFC #4084) (#4281)

Signed-off-by: Kushan A. <kahmadian@nvidia.com> Signed-off-by: kushanam <kushanam@users.noreply.github.com> Signed-off-by: Kushan A <kahmadian@nvidia.com> Signed-off-by: kahmadian <kahmadian@users.noreply.github.com> Co-authored-by: kushanam <kushanam@users.noreply.github.com> Co-authored-by: kahmadian <kahmadian@users.noreply.github.com>
2026-07-10 21:29:24 -06:00
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+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+"""Composable parallel strategies for vLLM-Omni.
+
+A small, runtime-agnostic vocabulary for declaring a stage's parallel layout
+(:class:`StrategySpec` + mesh/routing/aggregation patterns), plus the logic to
+translate a per-role stack of specs into concrete engine sizing and overlay it
+onto merged stage configs.
+
+The spec/pattern *types* are deliberately pure data with no engine imports; the
+translation and apply logic lives alongside them and consumes vLLM-Omni's own
+config objects.
+"""
+
+from vllm_omni.config.composable_parallel.aggregation import (
+    AGGREGATION_PATTERN_VARIANTS,
+    AggregationConflictError,
+    AggregationPattern,
+    AllGather,
+    Combine,
+    FanInByStage,
+    GatherDim,
+    StitchPipeline,
+    StitchSpatial,
+    TakeRank,
+    Union,
+)
+from vllm_omni.config.composable_parallel.apply import (
+    StrategyApplyError,
+    StrategyApplyResult,
+    apply_strategy_specs,
+    check_device_layout,
+)
+from vllm_omni.config.composable_parallel.routing import (
+    ROUTING_PATTERN_VARIANTS,
+    Broadcast,
+    DuplicateWithCondTag,
+    PartitionByHash,
+    PipelineMicrobatch,
+    RouteByExpert,
+    RouteByStage,
+    RoutingKeyError,
+    RoutingPattern,
+    ShardSequence,
+    ShardSpatial,
+)
+from vllm_omni.config.composable_parallel.spec import (
+    MESH_AXIS_KINDS,
+    KernelSpec,
+    LayerHookSpec,
+    MeshAxisKind,
+    MeshAxisSpec,
+    SpecMergeConflictError,
+    StrategySpec,
+)
+from vllm_omni.config.composable_parallel.translator import (
+    AxisTranslationError,
+    OmniParallelConfig,
+    translate_strategy_stack,
+)
+
+__all__ = [
+    # spec types
+    "MeshAxisKind",
+    "MESH_AXIS_KINDS",
+    "MeshAxisSpec",
+    "LayerHookSpec",
+    "KernelSpec",
+    "StrategySpec",
+    "SpecMergeConflictError",
+    # routing patterns
+    "RoutingPattern",
+    "RoutingKeyError",
+    "Broadcast",
+    "PartitionByHash",
+    "ShardSequence",
+    "ShardSpatial",
+    "RouteByExpert",
+    "PipelineMicrobatch",
+    "DuplicateWithCondTag",
+    "RouteByStage",
+    "ROUTING_PATTERN_VARIANTS",
+    # aggregation patterns
+    "AggregationPattern",
+    "AggregationConflictError",
+    "TakeRank",
+    "Union",
+    "GatherDim",
+    "AllGather",
+    "StitchSpatial",
+    "StitchPipeline",
+    "Combine",
+    "FanInByStage",
+    "AGGREGATION_PATTERN_VARIANTS",
+    # translation
+    "OmniParallelConfig",
+    "translate_strategy_stack",
+    "AxisTranslationError",
+    # apply
+    "apply_strategy_specs",
+    "StrategyApplyResult",
+    "check_device_layout",
+    "StrategyApplyError",
+]