diff --git a/src/LayerData.cpp b/src/LayerData.cpp
index d607c41..120f3c3 100644
--- a/src/LayerData.cpp
+++ b/src/LayerData.cpp
@@ -63,3 +63,23 @@ LayerData::Type LayerData::typeFromString(string_view typeName)
 		return Type::Other;
 	}
 }
+
+ostream& operator<< (ostream& o, const LayerData& layer)
+{
+    o << layer.name() << '(';
+    bool first = true;
+
+    for (auto d : layer.shape()) {
+        if (!first) {
+            o << ", ";
+        } else {
+            first = false;
+        }
+
+        o << d;
+    }
+
+    o << ')';
+
+    return o;
+}
diff --git a/src/LayerData.hpp b/src/LayerData.hpp
index 1a9ac30..1c2bdb3 100644
--- a/src/LayerData.hpp
+++ b/src/LayerData.hpp
@@ -1,5 +1,6 @@
 #pragma once
 
+#include <iostream>
 #include <memory>
 #include <string>
 #include <string_view>
@@ -7,44 +8,49 @@
 
 #include "utils.hpp"
 
-namespace fmri {
+namespace fmri
+{
 
-	using std::string;
-	using std::string_view;
-	using std::unique_ptr;
-	using std::vector;
+    using std::ostream;
+    using std::string;
+    using std::string_view;
+    using std::unique_ptr;
+    using std::vector;
 
-	class LayerData
-	{
-		public:
-			enum class Type {
-				Input,
-				Convolutional,
-				ReLU,
-				Pooling,
-				Output,
-				Other
-			};
+    class LayerData
+    {
+    public:
+        enum class Type
+        {
+            Input,
+            Convolutional,
+            ReLU,
+            Pooling,
+            Output,
+            Other
+        };
 
-			LayerData(const string& name, const vector<int>& shape, const DType* data, Type type);
-			LayerData(const LayerData&) = delete;
-			LayerData(LayerData&&) = default;
+        LayerData(const string &name, const vector<int> &shape, const DType *data, Type type);
+        LayerData(const LayerData &) = delete;
 
-			LayerData& operator=(const LayerData&) = delete;
-			LayerData& operator=(LayerData&&) = default;
+        LayerData(LayerData &&) = default;
+        LayerData &operator=(const LayerData &) = delete;
+        LayerData &operator=(LayerData &&) = default;
 
-			const string& name() const;
-			Type type() const;
-			const vector<int>& shape() const;
-			DType const * data() const;
-			size_t numEntries() const;
+        const string &name() const;
+        Type type() const;
+        const vector<int> &shape() const;
+        DType const *data() const;
+        size_t numEntries() const;
 
-			static Type typeFromString(string_view name);
+        static Type typeFromString(string_view name);
 
-		private:
-			string name_;
-			vector<int> shape_;
-			unique_ptr<DType[]> data_;
-			Type type_;
-	};
+    private:
+        string name_;
+        vector<int> shape_;
+        unique_ptr<DType[]> data_;
+        Type type_;
+    };
 }
+
+std::ostream& operator<<(std::ostream&, const fmri::LayerData&);