Implement layer interactions for softmax layer.

src/fmri/visualisations.cpp

@@ -221,6 +221,24 @@ static Animation *getNormalizingAnimation(const fmri::LayerData &prevState, cons
     }
 }
 
+static Animation *getSoftmaxAnimation(const fmri::LayerData &curState, const vector<float> &prevPositions,
+                                     const vector<float> &curPositions)
+{
+    CHECK_EQ(curState.shape().size(), 2) << "Softmax only supported for flat layers.";
+
+    std::vector<float> intensities(curState.data(), curState.data() + curState.numEntries());
+    rescale(intensities.begin(), intensities.end(), 0, 1);
+
+    EntryList entries;
+    for (auto i = 0u; i < intensities.size(); ++i) {
+        entries.emplace_back(intensities[i], make_pair(i, i));
+    }
+
+    return new ActivityAnimation(entries, prevPositions.data(), curPositions.data(), [](auto i) -> Color {
+        return {1 - i, 1 - i, 1};
+    });
+}
+
 Animation * fmri::getActivityAnimation(const fmri::LayerData &prevState, const fmri::LayerData &curState,
                                        const fmri::LayerInfo &layer, const vector<float> &prevPositions,
                                        const vector<float> &curPositions)
@@ -248,6 +266,9 @@ Animation * fmri::getActivityAnimation(const fmri::LayerData &prevState, const f
         case LayerInfo::Type::LRN:
             return getNormalizingAnimation(prevState, curState, prevPositions, curPositions);
 
+        case LayerInfo::Type::Softmax:
+            return getSoftmaxAnimation(curState, prevPositions, curPositions);
+
         default:
             return nullptr;
     }