diff --git a/setup.py b/setup.py
index 7795141a59a8b..5850ea183729a 100644
--- a/setup.py
+++ b/setup.py
@@ -27,6 +27,7 @@
             "pytest",
             "torch",
             "tqdm",
+            "onnx",
         ],
       },
       include_package_data=True)
diff --git a/test/test_openpilot_model.py b/test/test_openpilot_model.py
index 3fbe7183a9d7b..b8d9d19aae40b 100644
--- a/test/test_openpilot_model.py
+++ b/test/test_openpilot_model.py
@@ -6,7 +6,7 @@
 from extra.utils import fetch
 from tinygrad.tensor import Tensor
 
-def run_onnx(dat):
+def run_onnx(dat, inputs={}):
   onnx_model = onnx.load_model(dat)
 
   def shape_to_tuple(s): return tuple(x.dim_value for x in s.dim)
@@ -21,7 +21,14 @@ def attribute_to_dict(a): return {x.name:attribute_parse(x) for x in a}
 
   # get inputs
   for inp in onnx_model.graph.input:
-    tensors[inp.name] = Tensor.zeros(*shape_to_tuple(inp.type.tensor_type.shape))
+    shape = shape_to_tuple(inp.type.tensor_type.shape)
+    if inp.name in inputs:
+      input_shape = inputs[inp.name].shape
+      assert input_shape == shape, f"wrong shape for input {inp.name}, {input_shape} isn't {shape}"
+      tensors[inp.name] = Tensor(inputs[inp.name].astype(np.float32))
+    else:
+      print(f"filling {inp.name} shape {shape} with 0")
+      tensors[inp.name] = Tensor.zeros(*shape)
 
   # get weights and biases
   for inp in onnx_model.graph.initializer:
@@ -76,7 +83,14 @@ def attribute_to_dict(a): return {x.name:attribute_parse(x) for x in a}
 class TestOpenpilotModel(unittest.TestCase):
   def test(self):
     dat = fetch("https://github.com/commaai/openpilot/raw/7da48ebdba5e3cf4c0b8078c934bee9a199f0280/selfdrive/modeld/models/supercombo.onnx")
-    out = run_onnx(io.BytesIO(dat))
+    inputs = {
+      "input_imgs": np.random.randn(*(1, 12, 128, 256)),
+      "big_input_imgs": np.random.randn(*(1, 12, 128, 256)),
+      "desire": np.zeros((1, 8)),
+      "traffic_convention": np.array([[1., 0.]]),
+      "initial_state": np.zeros((1, 512))
+    }
+    out = run_onnx(io.BytesIO(dat), inputs)
     print(out)
 
 if __name__ == "__main__":
diff --git a/tinygrad/tensor.py b/tinygrad/tensor.py
index 25948127c8a89..81534da2c4902 100644
--- a/tinygrad/tensor.py
+++ b/tinygrad/tensor.py
@@ -260,8 +260,8 @@ def matmul(x, w):
   def transpose(self, order=(1,0)):
     return self.permute(order=order)
 
-  def flatten(self, dim=0):
-    return self.reshape(shape=tuple(list(self.shape[0:dim]) + [-1]))
+  def flatten(self, start_dim=0):
+    return self.reshape(shape=tuple(list(self.shape[0:start_dim]) + [-1]))
 
   def _canonicalize_reduce_axis(self, axis):
     if axis is None: axis = range(len(self.shape))