c2/lib/models/r3d_model.py [556:577]:
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        no_bias=no_bias
    )

    model.SpatialBN(
        'conv1',
        'conv1_spatbn_relu',
        64,
        epsilon=1e-3,
        momentum=spatial_bn_mom,
        is_test=is_test
    )
    model.Relu('conv1_spatbn_relu', 'conv1_spatbn_relu')

    (n1, n2, n3, n4) = BLOCK_CONFIG[model_depth]

    # Residual blocks...
    builder = VideoModelBuilder(model, 'conv1_spatbn_relu', no_bias=no_bias,
                                is_test=is_test, spatial_bn_mom=spatial_bn_mom)

    # conv_2x
    for _ in range(n1):
        builder.add_simple_block(
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c2/lib/models/r3d_model.py [771:792]:
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        no_bias=no_bias
    )

    model.SpatialBN(
        'conv1',
        'conv1_spatbn_relu',
        64,
        epsilon=1e-3,
        momentum=spatial_bn_mom,
        is_test=is_test
    )
    model.Relu('conv1_spatbn_relu', 'conv1_spatbn_relu')

    (n1, n2, n3, n4) = BLOCK_CONFIG[model_depth]

    # Residual blocks...
    builder = VideoModelBuilder(model, 'conv1_spatbn_relu', no_bias=no_bias,
                                is_test=is_test, spatial_bn_mom=spatial_bn_mom)

    # conv_2x
    for _ in range(n1):
        builder.add_simple_block(
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