fix divide by zero edge case in baselevel learning

.github/workflows/docs_clean_up.yml

@@ -0,0 +1,26 @@
+name: Doc Preview Cleanup
+
+on:
+  pull_request:
+    types: [closed]
+
+jobs:
+  doc-preview-cleanup:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout gh-pages branch
+        uses: actions/checkout@v2
+        with:
+          ref: gh-pages
+      - name: Delete preview and history + push changes
+        run: |
+            if [ -d "previews/PR$PRNUM" ]; then
+              git config user.name "Documenter.jl"
+              git config user.email "documenter@juliadocs.github.io"
+              git rm -rf "previews/PR$PRNUM"
+              git commit -m "delete preview"
+              git branch gh-pages-new $(echo "delete history" | git commit-tree HEAD^{tree})
+              git push --force origin gh-pages-new:gh-pages
+            fi
+        env:
+            PRNUM: ${{ github.event.number }}

Project.toml

@@ -1,7 +1,7 @@
 name = "ACTRModels"
 uuid = "c095b0ea-a6ca-5cbd-afed-dbab2e976880"
 authors = ["itsdfish"]
-version = "0.12.3"
+version = "0.12.4"
 
 [deps]
 ConcreteStructs = "2569d6c7-a4a2-43d3-a901-331e8e4be471"

src/MemoryFunctions.jl

@@ -35,7 +35,7 @@ function baselevel!(N, L, k, lags, d)
     if N > k
         tk = lags[k]
         x1 = (N - k) * (L^(1 - d) - tk^(1 - d))
-        x2 = (1 - d) * (L - tk)
+        x2 = (1 - d) * max(L - tk, .001)
         approx = x1 / x2
     end
     return log(exp(exact) + approx)