Fix sampling of CircularPrioritizedTraces

Author: Dharanish

src/samplers.jl

@@ -74,7 +74,7 @@ function StatsBase.sample(s::BatchSampler, e::EpisodesBuffer{<:Any, <:Any, <:Cir
     t = e.traces
     p = collect(deepcopy(t.priorities))
     w = StatsBase.FrequencyWeights(p)
-    w .*= e.sampleable_inds[1:end-1]
+    w .*= e.sampleable_inds[1:length(t)]
     inds = StatsBase.sample(s.rng, eachindex(w), w, s.batchsize)
     NamedTuple{(:key, :priority, names...)}((t.keys[inds], p[inds], map(x -> collect(t.traces[Val(x)][inds]), names)...))
 end
@@ -247,7 +247,7 @@ function StatsBase.sample(s::NStepBatchSampler{names}, e::EpisodesBuffer{<:Any,
     p = collect(deepcopy(t.priorities))
     w = StatsBase.FrequencyWeights(p)
     valids, ns = valid_range(s,e)
-    w .*= valids[1:end-1]
+    w .*= valids[1:length(t)]
     inds = StatsBase.sample(s.rng, eachindex(w), w, s.batchsize)
     merge(
         (key=t.keys[inds], priority=p[inds]),
@@ -362,7 +362,7 @@ function StatsBase.sample(s::MultiStepSampler{names}, e::EpisodesBuffer{<:Any, <
     p = collect(deepcopy(t.priorities))
     w = StatsBase.FrequencyWeights(p)
     valids, ns = valid_range(s,e)
-    w .*= valids[1:end-1]
+    w .*= valids[1:length(t)]
     inds = StatsBase.sample(s.rng, eachindex(w), w, s.batchsize)
     merge(
         (key=t.keys[inds], priority=p[inds]),