Function toNested

Convert a flat dictionary of tensors into a nested object.

For example, take the case:

{
  "layers.0.bias": b0,
  "layers.0.weight": w0,
  "layers.1.bias": b1,
  "layers.1.weight": w1,
}
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This would become:

{
  layers: [
    { bias: b0, weight: w0 },
    { bias: b1, weight: w1 },
  ],
}
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