From 5e38b73ef13d22fb8d8870d8d2b986f214f03e5c Mon Sep 17 00:00:00 2001
From: Lutz Roeder <lutzroeder@users.noreply.github.com>
Date: Wed, 31 Oct 2018 20:33:04 -0700
Subject: [PATCH] PyTorch FloatTensor serialization (#133)

---
 src/pickle.js        | 20 +++++++++++++++++---
 src/pytorch-model.js | 13 +++++++++++++
 2 files changed, 30 insertions(+), 3 deletions(-)

diff --git a/src/pickle.js b/src/pickle.js
index 6846915a93f..343272341b7 100644
--- a/src/pickle.js
+++ b/src/pickle.js
@@ -140,13 +140,27 @@ pickle.Unpickler = class {
                     var value = stack.pop();
                     var key = stack.pop();
                     var obj = stack[stack.length - 1];
-                    obj[key] = value;
+                    if (Array.isArray(obj)) {
+                        value.__id__ = key;
+                        obj.push(value);
+                    }
+                    else {
+                        obj[key] = value;
+                    }
                     break;
                 case pickle.OpCode.SETITEMS:
                     var index = marker.pop();
                     var obj = stack[index - 1];
-                    for (var position = index; position < stack.length; position += 2) {
-                        obj[stack[position]] = stack[position + 1];
+                    if (Array.isArray(obj)) {
+                        for (var position = index; position < stack.length; position += 2) {
+                            stack[position + 1].__id__ = stack[position];
+                            obj.push(stack[position + 1]);
+                        }
+                    }
+                    else {
+                        for (var position = index; position < stack.length; position += 2) {
+                            obj[stack[position]] = stack[position + 1];
+                        }
                     }
                     stack = stack.slice(0, index);
                     break;
diff --git a/src/pytorch-model.js b/src/pytorch-model.js
index b7ee82a2a6f..960167af143 100755
--- a/src/pytorch-model.js
+++ b/src/pytorch-model.js
@@ -110,6 +110,14 @@ class PyTorchModelFactory {
             constructorTable['torch.LongStorage'] = function (size) { this.size = size; this.dataTypeSize = 4; this.dataType = 'int64'; };
             constructorTable['torch.FloatStorage'] = function (size) { this.size = size; this.dataTypeSize = 4; this.dataType = 'float32'; };
             constructorTable['torch.DoubleStorage'] = function (size) { this.size = size; this.dataTypeSize = 8; this.dataType = 'float64'; };
+            constructorTable['torch.FloatTensor'] = function () {
+                this.__setstate__ = function(state) {
+                    this.storage = state[0];
+                    this.storage_offset = state[1];
+                    this.size = state[2];
+                    this.stride = state[3];
+                };
+            };
 
             functionTable['torch._utils._rebuild_tensor'] = function (storage, storage_offset, size, stride) {
                 var obj = {};
@@ -204,6 +212,11 @@ class PyTorchModelFactory {
                 }
             });
 
+            if (Array.isArray(root) && root.every((item) => item.__type__ == 'torch.FloatTensor')) {
+                callback(new PyTorchError("File does not contain a model graph. Use 'torch.save()' to save both the graph and tensor data."), null);
+                return;
+            }
+
             if (!root._modules) {
                 callback(new PyTorchError('Root object does not contain modules.'), null);
                 return;