diff --git a/deeplearning4j/deeplearning4j-core/src/test/java/org/deeplearning4j/nn/layers/pooling/GlobalPoolingMaskingTests.java b/deeplearning4j/deeplearning4j-core/src/test/java/org/deeplearning4j/nn/layers/pooling/GlobalPoolingMaskingTests.java
index 957d22a08..aebf23673 100644
--- a/deeplearning4j/deeplearning4j-core/src/test/java/org/deeplearning4j/nn/layers/pooling/GlobalPoolingMaskingTests.java
+++ b/deeplearning4j/deeplearning4j-core/src/test/java/org/deeplearning4j/nn/layers/pooling/GlobalPoolingMaskingTests.java
@@ -21,14 +21,13 @@ import org.deeplearning4j.nn.conf.ConvolutionMode;
 import org.deeplearning4j.nn.conf.MultiLayerConfiguration;
 import org.deeplearning4j.nn.conf.NeuralNetConfiguration;
 import org.deeplearning4j.nn.conf.distribution.NormalDistribution;
-import org.deeplearning4j.nn.conf.layers.ConvolutionLayer;
-import org.deeplearning4j.nn.conf.layers.GravesLSTM;
-import org.deeplearning4j.nn.conf.layers.OutputLayer;
-import org.deeplearning4j.nn.conf.layers.PoolingType;
+import org.deeplearning4j.nn.conf.layers.*;
+import org.deeplearning4j.nn.conf.layers.GlobalPoolingLayer;
 import org.deeplearning4j.nn.multilayer.MultiLayerNetwork;
 import org.deeplearning4j.nn.weights.WeightInit;
 import org.junit.Test;
 import org.nd4j.linalg.activations.Activation;
+import org.nd4j.linalg.api.buffer.DataType;
 import org.nd4j.linalg.api.ndarray.INDArray;
 import org.nd4j.linalg.api.ops.impl.broadcast.BroadcastMulOp;
 import org.nd4j.linalg.factory.Nd4j;
@@ -416,4 +415,53 @@ public class GlobalPoolingMaskingTests extends BaseDL4JTest {
             }
         }
     }
+
+    @Test
+    public void testMaskLayerDataTypes(){
+
+        for(DataType dt : new DataType[]{DataType.FLOAT16, DataType.BFLOAT16, DataType.FLOAT, DataType.DOUBLE,
+                DataType.INT8, DataType.INT16, DataType.INT32, DataType.INT64,
+                DataType.UINT8, DataType.UINT16, DataType.UINT32, DataType.UINT64}){
+            INDArray mask = Nd4j.rand(DataType.FLOAT, 2, 10).addi(0.3).castTo(dt);
+
+            for(DataType networkDtype : new DataType[]{DataType.FLOAT16, DataType.BFLOAT16, DataType.FLOAT, DataType.DOUBLE}){
+
+                INDArray in = Nd4j.rand(networkDtype, 2, 5, 10);
+                INDArray label1 = Nd4j.rand(networkDtype, 2, 5);
+                INDArray label2 = Nd4j.rand(networkDtype, 2, 5, 10);
+
+                for(PoolingType pt : PoolingType.values()) {
+                    //System.out.println("Net: " + networkDtype + ", mask: " + dt + ", pt=" + pt);
+
+                    MultiLayerConfiguration conf = new NeuralNetConfiguration.Builder()
+                            .list()
+                            .layer(new GlobalPoolingLayer(pt))
+                            .layer(new OutputLayer.Builder().nIn(5).nOut(5).activation(Activation.TANH).lossFunction(LossFunctions.LossFunction.MSE).build())
+                            .build();
+
+                    MultiLayerNetwork net = new MultiLayerNetwork(conf);
+                    net.init();
+
+                    net.output(in, false, mask, null);
+                    net.output(in, false, mask, null);
+
+
+                    MultiLayerConfiguration conf2 = new NeuralNetConfiguration.Builder()
+
+                            .list()
+                            .layer(new RnnOutputLayer.Builder().nIn(5).nOut(5).activation(Activation.TANH).lossFunction(LossFunctions.LossFunction.MSE).build())
+                            .build();
+
+                    MultiLayerNetwork net2 = new MultiLayerNetwork(conf2);
+                    net2.init();
+
+                    net2.output(in, false, mask, mask);
+                    net2.output(in, false, mask, mask);
+
+                    net.fit(in, label1, mask, null);
+                    net2.fit(in, label2, mask, mask);
+                }
+            }
+        }
+    }
 }
diff --git a/deeplearning4j/deeplearning4j-nn/src/main/java/org/deeplearning4j/nn/layers/recurrent/RnnOutputLayer.java b/deeplearning4j/deeplearning4j-nn/src/main/java/org/deeplearning4j/nn/layers/recurrent/RnnOutputLayer.java
index 27cc0f9df..93f77ad67 100644
--- a/deeplearning4j/deeplearning4j-nn/src/main/java/org/deeplearning4j/nn/layers/recurrent/RnnOutputLayer.java
+++ b/deeplearning4j/deeplearning4j-nn/src/main/java/org/deeplearning4j/nn/layers/recurrent/RnnOutputLayer.java
@@ -131,7 +131,7 @@ public class RnnOutputLayer extends BaseOutputLayer<org.deeplearning4j.nn.conf.l
         INDArray W = getParamWithNoise(DefaultParamInitializer.WEIGHT_KEY, training, workspaceMgr);
 
         applyDropOutIfNecessary(training, workspaceMgr);
-        INDArray input2d = TimeSeriesUtils.reshape3dTo2d(input, LayerWorkspaceMgr.noWorkspaces(), ArrayType.FF_WORKING_MEM);
+        INDArray input2d = TimeSeriesUtils.reshape3dTo2d(input.castTo(W.dataType()), workspaceMgr, ArrayType.FF_WORKING_MEM);
 
         INDArray act2d = layerConf().getActivationFn().getActivation(input2d.mmul(W).addiRowVector(b), training);
         if (maskArray != null) {
diff --git a/deeplearning4j/deeplearning4j-nn/src/main/java/org/deeplearning4j/util/MaskedReductionUtil.java b/deeplearning4j/deeplearning4j-nn/src/main/java/org/deeplearning4j/util/MaskedReductionUtil.java
index 23083f3a4..5fa59dd5b 100644
--- a/deeplearning4j/deeplearning4j-nn/src/main/java/org/deeplearning4j/util/MaskedReductionUtil.java
+++ b/deeplearning4j/deeplearning4j-nn/src/main/java/org/deeplearning4j/util/MaskedReductionUtil.java
@@ -56,6 +56,7 @@ public class MaskedReductionUtil {
             throw new IllegalArgumentException("Expect rank 2 array for mask: got " + mask.rank());
         }
 
+        toReduce = toReduce.castTo(dataType);
         mask = mask.castTo(dataType);
 
         //Sum pooling: easy. Multiply by mask, then sum as normal
@@ -64,13 +65,7 @@ public class MaskedReductionUtil {
 
         switch (poolingType) {
             case MAX:
-                //TODO This is ugly - replace it with something better... Need something like a Broadcast CAS op
-                INDArray negInfMask;
-                if(mask.dataType() == DataType.BOOL){
-                    negInfMask = Transforms.not(mask).castTo(dataType);
-                } else {
-                    negInfMask = mask.rsub(1.0);
-                }
+                INDArray negInfMask = mask.castTo(dataType).rsub(1.0);
                 BooleanIndexing.replaceWhere(negInfMask, Double.NEGATIVE_INFINITY, Conditions.equals(1.0));
 
                 INDArray withInf = Nd4j.createUninitialized(dataType, toReduce.shape());
@@ -121,18 +116,14 @@ public class MaskedReductionUtil {
         //Mask: [minibatch, tsLength]
         //Epsilon: [minibatch, vectorSize]
 
+        mask = mask.castTo(input.dataType());
+
         switch (poolingType) {
             case MAX:
-                //TODO This is ugly - replace it with something better... Need something like a Broadcast CAS op
-                INDArray negInfMask;
-                if(mask.dataType() == DataType.BOOL){
-                    negInfMask = Transforms.not(mask).castTo(Nd4j.defaultFloatingPointType());
-                } else {
-                    negInfMask = mask.rsub(1.0);
-                }
+                INDArray negInfMask = mask.rsub(1.0);
                 BooleanIndexing.replaceWhere(negInfMask, Double.NEGATIVE_INFINITY, Conditions.equals(1.0));
 
-                INDArray withInf = Nd4j.createUninitialized(input.shape());
+                INDArray withInf = Nd4j.createUninitialized(input.dataType(), input.shape());
                 Nd4j.getExecutioner().exec(new BroadcastAddOp(input, negInfMask, withInf, 0, 2));
                 //At this point: all the masked out steps have value -inf, hence can't be the output of the MAX op
 
@@ -145,7 +136,7 @@ public class MaskedReductionUtil {
                 //if out = avg(in,dims) then dL/dIn = 1/N * dL/dOut
                 //With masking: N differs for different time series
 
-                INDArray out = Nd4j.createUninitialized(input.shape(), 'f');
+                INDArray out = Nd4j.createUninitialized(input.dataType(), input.shape(), 'f');
 
                 //Broadcast copy op, then divide and mask to 0 as appropriate
                 Nd4j.getExecutioner().exec(new BroadcastCopyOp(out, epsilon2d, out, 0, 1));
@@ -162,7 +153,7 @@ public class MaskedReductionUtil {
 
             case PNORM:
                 //Similar to average and sum pooling: there's no N term here, so we can just set the masked values to 0
-                INDArray masked2 = Nd4j.createUninitialized(input.shape());
+                INDArray masked2 = Nd4j.createUninitialized(input.dataType(), input.shape());
                 Nd4j.getExecutioner().exec(new BroadcastMulOp(input, mask, masked2, 0, 2));
 
                 INDArray abs = Transforms.abs(masked2, true);