72 lines
2.8 KiB
Haskell
72 lines
2.8 KiB
Haskell
-- Copyright 2016 TensorFlow 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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-- http://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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{-# LANGUAGE DataKinds #-}
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{-# LANGUAGE KindSignatures #-}
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{-# LANGUAGE OverloadedStrings #-}
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{-# LANGUAGE ScopedTypeVariables #-}
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-- | Queues in TensorFlow graph. Very limited support for now.
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module TensorFlow.Queue (Queue, makeQueue, enqueue, dequeue) where
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import Data.ByteString (ByteString)
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import Data.Int (Int64)
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import Data.Proxy (Proxy(..))
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import Lens.Family2 ((.~), (&))
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import TensorFlow.Build (ControlNode, MonadBuild, build, addInitializer, opAttr, opDef)
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import TensorFlow.BuildOp (buildOp)
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import TensorFlow.ControlFlow (group)
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import qualified TensorFlow.GenOps.Core as CoreOps
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import TensorFlow.Tensor (Ref, Value, Tensor, TensorList)
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import TensorFlow.Types (TensorTypes, fromTensorTypes)
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-- | A queue carrying tuples.
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data Queue (as :: [*]) = Queue { handle :: Handle }
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type Handle = Tensor Ref ByteString
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-- | Adds the given values to the queue.
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enqueue :: forall as v m . (MonadBuild m, TensorTypes as)
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=> Queue as
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-> TensorList v as
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-> m ControlNode
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enqueue = CoreOps.queueEnqueue . handle
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-- | Retrieves the values from the queue.
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dequeue :: forall as m . (MonadBuild m, TensorTypes as)
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=> Queue as
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-> m (TensorList Value as)
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-- ^ Dequeued tensors. They are coupled in a sense
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-- that values appear together, even if they are
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-- not consumed together.
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dequeue = CoreOps.queueDequeue . handle
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-- | Creates a new queue with the given capacity and shared name.
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makeQueue :: forall as m . (MonadBuild m, TensorTypes as)
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=> Int64 -- ^ The upper bound on the number of elements in
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-- this queue. Negative numbers mean no limit.
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-> ByteString -- ^ If non-empty, this queue will be shared
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-- under the given name across multiple sessions.
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-> m (Queue as)
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makeQueue capacity sharedName = do
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q <- build $ buildOp [] (opDef "FIFOQueue"
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& opAttr "component_types" .~ fromTensorTypes (Proxy :: Proxy as)
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& opAttr "shared_name" .~ sharedName
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& opAttr "capacity" .~ capacity
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)
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group q >>= addInitializer
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return (Queue q)
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-- TODO(gnezdo): Figure out the closing story for queues.
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