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# pylint: disable=invalid-name
# ruff: noqa: E501
"""Generator for CUTLASS layer norm kernels."""

from .library import substitute_template


def instantiate_layer_norm_template(attrs):
    """
    Return CUTLASS host code for layer norm based on
    a template and the provided attribute map.
    """
    template = """
    using data_type = ${data_type};
    using namespace cutlass::layout;

    int M = ${M};
    int N = ${N};
    cutlass::MatrixCoord size(M, N);
    auto layout_2D = RowMajor::packed(size);
    auto layout_channels = RowMajor::packed({1, N});

    cutlass::TensorRef<data_type, RowMajor> _input((data_type*)${input}->data, layout_2D);
    cutlass::TensorRef<data_type, RowMajor> _gamma((data_type*)${gamma}->data, layout_channels);
    cutlass::TensorRef<data_type, RowMajor> _beta((data_type*)${beta}->data, layout_channels);
    cutlass::TensorRef<data_type, RowMajor> _output((data_type*)out0->data, layout_2D);

    cudaStream_t stream = static_cast<cudaStream_t>(TVMFFIEnvGetStream(kDLCUDA, ${input}->device.device_id));

    cutlass::layernorm(size, _output, _input, _gamma, _beta, stream);
    """
    return substitute_template(template, attrs)
