diff --git a/package-lock.json b/package-lock.json
index 9f63955..0d96f7d 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -14,7 +14,7 @@
                 "laravel-vite-plugin": "^2.0.0",
                 "lucide-vue-next": "^0.468.0",
                 "radix-ui": "^1.4.3",
-                "reka-ui": "^2.9.0",
+                "reka-ui": "^2.9.2",
                 "tailwind-merge": "^3.2.0",
                 "tailwindcss": "^4.1.1",
                 "tw-animate-css": "^1.2.5",
@@ -7386,9 +7386,9 @@
             }
         },
         "node_modules/reka-ui": {
-            "version": "2.9.0",
-            "resolved": "https://registry.npmjs.org/reka-ui/-/reka-ui-2.9.0.tgz",
-            "integrity": "sha512-5dpp80u109iLTbRBu+jhAk8R/877/JN20gYGjb3GsuAgS7E/5QTX5ZxuzWtZAVbChBDYDpXc8pkaQAFpa6s+4w==",
+            "version": "2.9.2",
+            "resolved": "https://registry.npmjs.org/reka-ui/-/reka-ui-2.9.2.tgz",
+            "integrity": "sha512-/t4e6y1hcG+uDuRfpg6tbMz3uUEvRzNco6NeYTufoJeUghy5Iosxos5YL/p+ieAsid84sdMX9OrgDqpEuCJhBw==",
             "dependencies": {
                 "@floating-ui/dom": "^1.6.13",
                 "@floating-ui/vue": "^1.1.6",
diff --git a/package.json b/package.json
index bc38233..8b0ee51 100644
--- a/package.json
+++ b/package.json
@@ -45,7 +45,7 @@
         "laravel-vite-plugin": "^2.0.0",
         "lucide-vue-next": "^0.468.0",
         "radix-ui": "^1.4.3",
-        "reka-ui": "^2.9.0",
+        "reka-ui": "^2.9.2",
         "tailwind-merge": "^3.2.0",
         "tailwindcss": "^4.1.1",
         "tw-animate-css": "^1.2.5",
diff --git a/resources/js/components/PerceptronIterationsErrorsGraph.vue b/resources/js/components/PerceptronIterationsErrorsGraph.vue
index 09c597b..c100b03 100644
--- a/resources/js/components/PerceptronIterationsErrorsGraph.vue
+++ b/resources/js/components/PerceptronIterationsErrorsGraph.vue
@@ -1,46 +1,55 @@
 <script setup lang="ts">
 import type { ChartData } from 'chart.js';
+import { computed, ref } from 'vue';
 import { Bar } from 'vue-chartjs';
 import { colors, gridColor, gridColorBold } from '@/types/graphs';
 import type { Iteration } from '@/types/perceptron';
+import Toggle from './ui/toggle/Toggle.vue';
 
 const props = defineProps<{
     iterations: Iteration[];
 }>();
 
+const epochErrorOnly = ref<boolean>(false);
+
 /**
- * Return the datasets of the iterations with the form { label: `Exemple ${exampleIndex}`, data: [error for iteration 1, error for iteration 2, ...] }
+ * Datasets of the iterations with the form { label: `Exemple ${exampleIndex}`, data: [error for iteration 1, error for iteration 2, ...] }
  */
-function getPerceptronErrorsPerIteration(): ChartData<
-    'bar',
-    (number | [number, number] | null)[]
->[] {
+const datasets = computed<
+    ChartData<'bar', (number | [number, number] | null)[]>[]
+>(() => {
     const datasets: ChartData<'bar', (number | [number, number] | null)[]>[] =
         [];
     const epochAverageError: number[] = [];
 
     const backgroundColors = colors;
 
+    const exampleCountPerEpoch: Record<number, number> = {};
+
     props.iterations.forEach((iteration) => {
-        const exampleLabel = `Exemple ${iteration.exampleIndex}`;
-        let dataset = datasets.find((d) => d.label === exampleLabel);
-        if (!dataset) {
-            dataset = {
-                label: exampleLabel,
-                data: [],
-                order: 1,
-                backgroundColor:
-                    backgroundColors[
-                        iteration.exampleIndex % backgroundColors.length
-                    ],
-            };
-            datasets.push(dataset);
+        if (!epochErrorOnly.value) {
+            const exampleLabel = `Exemple ${iteration.exampleIndex}`;
+            let dataset = datasets.find((d) => d.label === exampleLabel);
+            if (!dataset) {
+                dataset = {
+                    label: exampleLabel,
+                    data: [],
+                    order: 1,
+                    backgroundColor:
+                        backgroundColors[
+                            iteration.exampleIndex % backgroundColors.length
+                        ],
+                };
+                datasets.push(dataset);
+            }
+            dataset.data.push(iteration.error);
         }
-        dataset.data.push(iteration.error);
+
+        exampleCountPerEpoch[iteration.epoch] = (exampleCountPerEpoch[iteration.epoch] || 0) + 1;
 
         // Epoch error
-        epochAverageError[iteration.epoch - 1] =
-            (epochAverageError[iteration.epoch - 1] || 0) +
+        epochAverageError[iteration.epoch] =
+            (epochAverageError[iteration.epoch] || 0) +
             iteration.error ** 2 / 2;
     });
 
@@ -54,7 +63,7 @@ function getPerceptronErrorsPerIteration(): ChartData<
     // Epoch error
     const epochErrorDataset = {
         type: 'line',
-        label: "Erreur de l'époque",
+        label: "Erreur quadratique moyenne de l'époque",
         data: [],
         backgroundColor: '#fff',
         borderColor: '#fff',
@@ -62,14 +71,15 @@ function getPerceptronErrorsPerIteration(): ChartData<
         tension: 0.3,
     };
 
-    epochAverageError.forEach((error) => {
-        epochErrorDataset.data.push(error);
+    epochAverageError.forEach((error, index) => {
+        const exampleCount = exampleCountPerEpoch[index] || 1; // Avoid division by zero
+        epochErrorDataset.data.push(error / exampleCount);
     });
 
     datasets.push(epochErrorDataset);
 
     return datasets;
-}
+});
 </script>
 
 <template>
@@ -111,7 +121,12 @@ function getPerceptronErrorsPerIteration(): ChartData<
                 }
                 return labels;
             }, [] as string[]),
-            datasets: getPerceptronErrorsPerIteration(),
+            datasets: datasets,
         }"
     />
+    <div class="flex items-center gap-3">
+        <Toggle v-model="epochErrorOnly" class="cursor-pointer" variant="outline" id="epoch-error-only"
+            >Afficher uniquement l'erreur quadratique moyenne de l'époque</Toggle
+        >
+    </div>
 </template>
diff --git a/resources/js/components/ui/toggle/Toggle.vue b/resources/js/components/ui/toggle/Toggle.vue
new file mode 100644
index 0000000..aea8e17
--- /dev/null
+++ b/resources/js/components/ui/toggle/Toggle.vue
@@ -0,0 +1,35 @@
+<script setup lang="ts">
+import type { ToggleEmits, ToggleProps } from "reka-ui"
+import type { HTMLAttributes } from "vue"
+import type { ToggleVariants } from "."
+import { reactiveOmit } from "@vueuse/core"
+import { Toggle, useForwardPropsEmits } from "reka-ui"
+import { cn } from "@/lib/utils"
+import { toggleVariants } from "."
+
+const props = withDefaults(defineProps<ToggleProps & {
+  class?: HTMLAttributes["class"]
+  variant?: ToggleVariants["variant"]
+  size?: ToggleVariants["size"]
+}>(), {
+  variant: "default",
+  size: "default",
+  disabled: false,
+})
+
+const emits = defineEmits<ToggleEmits>()
+
+const delegatedProps = reactiveOmit(props, "class", "size", "variant")
+const forwarded = useForwardPropsEmits(delegatedProps, emits)
+</script>
+
+<template>
+  <Toggle
+    v-slot="slotProps"
+    data-slot="toggle"
+    v-bind="forwarded"
+    :class="cn(toggleVariants({ variant, size }), props.class)"
+  >
+    <slot v-bind="slotProps" />
+  </Toggle>
+</template>
diff --git a/resources/js/components/ui/toggle/index.ts b/resources/js/components/ui/toggle/index.ts
new file mode 100644
index 0000000..d873390
--- /dev/null
+++ b/resources/js/components/ui/toggle/index.ts
@@ -0,0 +1,28 @@
+import type { VariantProps } from "class-variance-authority"
+import { cva } from "class-variance-authority"
+
+export { default as Toggle } from "./Toggle.vue"
+
+export const toggleVariants = cva(
+  "inline-flex items-center justify-center gap-2 rounded-md text-sm font-medium hover:bg-muted hover:text-muted-foreground disabled:pointer-events-none disabled:opacity-50 data-[state=on]:bg-accent data-[state=on]:text-accent-foreground [&_svg]:pointer-events-none [&_svg:not([class*='size-'])]:size-4 [&_svg]:shrink-0 focus-visible:border-ring focus-visible:ring-ring/50 focus-visible:ring-[3px] outline-none transition-[color,box-shadow] aria-invalid:ring-destructive/20 dark:aria-invalid:ring-destructive/40 aria-invalid:border-destructive whitespace-nowrap",
+  {
+    variants: {
+      variant: {
+        default: "bg-transparent",
+        outline:
+          "border border-input bg-transparent shadow-xs hover:bg-accent hover:text-accent-foreground",
+      },
+      size: {
+        default: "h-9 px-2 min-w-9",
+        sm: "h-8 px-1.5 min-w-8",
+        lg: "h-10 px-2.5 min-w-10",
+      },
+    },
+    defaultVariants: {
+      variant: "default",
+      size: "default",
+    },
+  },
+)
+
+export type ToggleVariants = VariantProps<typeof toggleVariants>