def init_weights(self):
        """
        Default initialization for Parameters of Module.
        """
        constant_(self.sampling_offsets.weight.data, 0.0)
        thetas = torch.arange(self.num_heads, dtype=torch.float32) * (
            2.0 * math.pi / self.num_heads
        )
        grid_init = torch.stack([thetas.cos(), thetas.sin()], -1)
        grid_init = (
            (grid_init / grid_init.abs().max(-1, keepdim=True)[0])
            .view(self.num_heads, 1, 1, 2)
            .repeat(1, self.num_levels, self.num_points, 1)
        )
        for i in range(self.num_points):
            grid_init[:, :, i, :] *= i + 1
        with torch.no_grad():
            self.sampling_offsets.bias = nn.Parameter(grid_init.view(-1))
        constant_(self.attention_weights.weight.data, 0.0)
        constant_(self.attention_weights.bias.data, 0.0)
        xavier_uniform_(self.value_proj.weight.data)
        constant_(self.value_proj.bias.data, 0.0)
        xavier_uniform_(self.output_proj.weight.data)
        constant_(self.output_proj.bias.data, 0.0)

        Default initialization for Parameters of Module.
        
groundingdino/models/GroundingDINO/ms_deform_attn.py