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eheat

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This package serves as a bridge between the ggplot2 and ComplexHeatmap packages. Essentially, all ggplot2 geometries and operations can be utilized in ComplexHeatmap through the eheat package, with the exception of facet operations (and you shouldn’t do it in eheat package). Fortunately, ComplexHeatmap is capable of handling these operations independently, rendering them unnecessary.

Installation

You can install the development version of eheat from GitHub with:

if (!requireNamespace("pak")) {
  install.packages("pak",
    repos = sprintf(
      "https://r-lib.github.io/p/pak/devel/%s/%s/%s",
      .Platform$pkgType, R.Version()$os, R.Version()$arch
    )
  )
}
pak::pkg_install("Yunuuuu/eheat")
library(eheat)
#> Loading required package: ggplot2

Let’s begin by creating some example data, following code was copied from ComplexHeatmap book directly

set.seed(123)
nr1 <- 4
nr2 <- 8
nr3 <- 6
nr <- nr1 + nr2 + nr3
nc1 <- 6
nc2 <- 8
nc3 <- 10
nc <- nc1 + nc2 + nc3
mat <- cbind(
  rbind(
    matrix(rnorm(nr1 * nc1, mean = 1, sd = 0.5), nrow = nr1),
    matrix(rnorm(nr2 * nc1, mean = 0, sd = 0.5), nrow = nr2),
    matrix(rnorm(nr3 * nc1, mean = 0, sd = 0.5), nrow = nr3)
  ),
  rbind(
    matrix(rnorm(nr1 * nc2, mean = 0, sd = 0.5), nrow = nr1),
    matrix(rnorm(nr2 * nc2, mean = 1, sd = 0.5), nrow = nr2),
    matrix(rnorm(nr3 * nc2, mean = 0, sd = 0.5), nrow = nr3)
  ),
  rbind(
    matrix(rnorm(nr1 * nc3, mean = 0.5, sd = 0.5), nrow = nr1),
    matrix(rnorm(nr2 * nc3, mean = 0.5, sd = 0.5), nrow = nr2),
    matrix(rnorm(nr3 * nc3, mean = 1, sd = 0.5), nrow = nr3)
  )
)
mat <- mat[sample(nr, nr), sample(nc, nc)] # random shuffle rows and columns
rownames(mat) <- paste0("row", seq_len(nr))
colnames(mat) <- paste0("column", seq_len(nc))
small_mat <- mat[1:9, 1:9]

The core components of the eheat package are the ggheat and gganno functions, which encompass all necessary functionalities. The ggheat function acts as a substitute for the ComplexHeatmap::Heatmap function, while gganno replaces the anno_* functions in the ComplexHeatmap package, offering a comprehensive solution for our requirements. One of the key advantages of using ggplot2 in ComplexHeatmap is the ease of plotting statistical annotations. Another benefit is that the legends can be internally extracted from the ggplot2 object, eliminating the need for manual addition of legends. In addition, the eheat package also includes the eheat_anno function, which serves as a counterpart to HeatmapAnnotation function. This function offers the advantage of automatic guessing of the which argument when used in conjunction with the ggheat function.

ggheat

Using ggheat, it is effortless to create a simple Heatmap. The default color mapping was not consistent between ComplexHeatmap and ggplot2.

draw(ggheat(small_mat))

You do not need to explicitly specify the color mapping as you can utilize the scale_* function directly from ggplot2. All guide legends will directly extracted from ggplot2. The essential parameter of ggheat is ggfn, which accepts a ggplot2 object with a default data and mapping created by ggplot(data, aes(.data$x, .data$y)). the data contains following columns:

  • .slice: slice number, combine .slice_row and .slice_column.

  • .slice_row: the slice row number

  • .slice_column: the slice column number

  • .row_names and .column_names: the row and column names of the original matrix (only applicable when names exist).

  • .row_index and .column_index: the row and column index of the original matrix.

  • x and y: the x and y coordinates

  • value: the actual matrix value for the heatmap matrix.

pdf(NULL)
draw(ggheat(small_mat, function(x) {
  print(head(x$data))
  x
}))
#>   .slice .slice_row .slice_column .row_names .column_names .row_index
#> 1   r1c1          1             1       row1       column1          1
#> 2   r1c1          1             1       row1       column2          1
#> 3   r1c1          1             1       row1       column3          1
#> 4   r1c1          1             1       row1       column4          1
#> 5   r1c1          1             1       row1       column5          1
#> 6   r1c1          1             1       row1       column6          1
#>   .column_index x y      value
#> 1             1 1 2  0.9047416
#> 2             2 8 2 -0.3522982
#> 3             3 6 2  0.5016096
#> 4             4 2 2  1.2676994
#> 5             5 3 2  0.8251229
#> 6             6 7 2  0.1621522
dev.off()
#> png 
#>   2

The richness of the scale_* function in ggplot2 makes it easy to modify the color mapping.

draw(ggheat(small_mat, function(p) {
  # will use zero as midpoint
  p + scale_fill_gradient2()
}))

draw(ggheat(small_mat, function(p) {
  p + scale_fill_viridis_c(option = "magma")
}))

Legends can be controlled by guide_* function in ggplot2.

draw(ggheat(small_mat, function(p) {
  p + scale_fill_viridis_c(guide = guide_colorbar(direction = "horizontal"))
}))

You can add more geoms.

draw(
  ggheat(small_mat, function(p) {
    p +
      geom_text(aes(label = sprintf("%d * %d", .row_index, .column_index)))
  })
)

You can also use the same way in ComplexHeatmap to prevent the internal rect filling by setting rect_gp = gpar(type = "none"). The clustering is still applied but nothing in drawn on the heatmap body.

draw(ggheat(small_mat, rect_gp = gpar(type = "none")))

Note that the background is different between ggplot2 and ComplexHeatmap. However, the theme system in ggplot2 makes it easy to modify and customize the background.

draw(
  ggheat(small_mat, function(p) {
    p +
      geom_text(aes(label = sprintf("%d * %d", .row_index, .column_index))) +
      theme_bw()
  }, rect_gp = gpar(type = "none"))
)

You can customize the heatmap filling easily with geom_tile.

draw(
  ggheat(small_mat, function(p) {
    p +
      geom_tile(
        aes(fill = value),
        width = 1L, height = 1L,
        data = ~ dplyr::filter(.x, y <= x)
      ) +
      geom_text(
        aes(label = sprintf("%d * %d", .row_index, .column_index)),
        data = ~ dplyr::filter(.x, y >= x)
      ) +
      theme_bw()
  }, rect_gp = gpar(type = "none"))
)

All the functionalities of the ComplexHeatmap::Heatmap function can be used as is.

draw(ggheat(small_mat, function(p) {
  p + scale_fill_viridis_c()
}, column_km = 2L))

draw(ggheat(small_mat, function(p) {
  p + scale_fill_viridis_c()
}, column_km = 2L, row_km = 3))

draw(ggheat(small_mat, function(p) {
  p +
    geom_text(aes(label = sprintf("%d * %d", .row_index, .column_index))) +
    scale_fill_viridis_c()
}, column_km = 2L, row_km = 3))

We can combine layer_fun or cell_fun from ComplexHeatmap with ggfn

draw(
  ggheat(small_mat,
    layer_fun = function(...) {
      grid::grid.rect(gp = gpar(lwd = 2, fill = "transparent", col = "red"))
    }, column_km = 2L, row_km = 3
  )
)

ggheat only takes over the heatmap body and legends.The row names and column names are controlled by the ComplexHeatmap::Heatmap function.

draw(ggheat(small_mat, function(p) {
  p + scale_fill_viridis_c()
}, column_km = 2L, row_km = 3, row_names_gp = gpar(col = "red")))

While the legends are controlled by ggplot2, the default legend name is taken from ComplexHeatmap::Heatmap in order to maintain consistency.

draw(
  ggheat(small_mat, function(p) {
    p + scale_fill_viridis_c()
  },
  column_km = 2L, row_km = 3, row_names_gp = gpar(col = "red"),
  name = "ComplexHeatmap"
  )
)

Nevertheless, you can directly override it in ggfn.

draw(
  ggheat(small_mat, function(p) {
    p + scale_fill_viridis_c(name = "ggplot2")
  },
  column_km = 2L, row_km = 3, row_names_gp = gpar(col = "red"),
  name = "ComplexHeatmap"
  )
)

Inside guides will be kept in the heatmap body panel since this type of legend should be intentionally placed by the user, so ggheat will not include it in the collection.

draw(
  ggheat(small_mat, function(p) {
    p +
      geom_tile(
        aes(fill = value),
        width = 1L, height = 1L,
        data = ~ dplyr::filter(.x, y <= x)
      ) +
      theme_bw() +
      theme(
        legend.position = "inside",
        legend.position.inside = c(0.2, 0.3)
      )
  }, rect_gp = gpar(type = "none"), column_km = 2L, row_km = 3)
)

gganno

The same with ggheat, the essential parameter of gganno is also the ggfn, which accepts a ggplot2 object with a default data and mapping created by ggplot(data, aes(.data$x)) (which = "column") / ggplot(data, ggplot2::aes(y = .data$y)) (which = "row").

If the original data is a matrix, it’ll be reshaped into a long-format data frame in the ggplot2 plot data. The final ggplot2 plot data will contain following columns:

  • .slice: the slice row (which = "row") or column (which = "column") number.

  • .row_names and .row_index: the row names (only applicable when names exist) and index of the original data.

  • .column_names and .column_index: the column names (only applicable when names exist) and index of the original data (only applicable when the original data is a matrix).

  • x / y: indicating the x-axis (or y-axis) coordinates. Don’t use coord_flip to flip coordinates as it may disrupt internal operations.

  • value: the actual matrix value of the annotation matrix (only applicable when the original data is a matrix).

gganno can be seamlessly combined with both ggheat and ComplexHeatmap::Heatmap, although legends will not be extracted in the later case.

If a matrix is provided, it will be reshaped into long-format data.frame

pdf(NULL)
draw(ggheat(small_mat,
  top_annotation = eheat_anno(
    foo = gganno(
      data = matrix(1:10, nrow = nrow(small_mat)),
      function(p) {
        print(head(p$data))
        p
      }
    )
  )
))
#> Warning in matrix(1:10, nrow = nrow(small_mat)): data length [10] is not a
#> sub-multiple or multiple of the number of rows [9]
#>   .slice .row_index .column_index x value
#> 1      1          1             1 1     1
#> 2      1          1             2 1    10
#> 3      1          2             1 8     2
#> 4      1          2             2 8     1
#> 5      1          3             1 6     3
#> 6      1          3             2 6     2
dev.off()
#> png 
#>   2

If a data frame is provided, it will be preserved in its original form with additional necessary column added.

pdf(NULL)
draw(ggheat(small_mat,
  top_annotation = eheat_anno(
    foo = gganno(
      data = data.frame(
        value = seq_len(nrow(small_mat)),
        letter = sample(letters, nrow(small_mat), replace = TRUE)
      ),
      function(p) {
        print(head(p$data))
        p
      }
    )
  )
))
#>   .slice .row_names .row_index x value letter
#> 1      1          1          1 1     1      w
#> 2      1          2          2 8     2      r
#> 3      1          3          3 6     3      l
#> 4      1          4          4 2     4      r
#> 5      1          5          5 3     5      g
#> 6      1          6          6 7     6      z
dev.off()
#> png 
#>   2

If provided an atomic vector, it will be converted into a matrix and then reshaped into long-format data.frame.

pdf(NULL)
draw(ggheat(small_mat,
  top_annotation = eheat_anno(
    foo = gganno(
      data = sample(1:10, nrow(small_mat)),
      function(p) {
        print(head(p$data))
        p
      }
    )
  )
))
#> ℹ convert simple vector to one-column matrix
#>   .slice .column_names .row_index .column_index x value
#> 1      1            V1          1             1 1     9
#> 2      1            V1          2             1 8     3
#> 3      1            V1          3             1 6     1
#> 4      1            V1          4             1 2    10
#> 5      1            V1          5             1 3     7
#> 6      1            V1          6             1 7     6
dev.off()
#> png 
#>   2

If no data is provided, the heatmap matrix will be used, the same principal applied in the matrix (reshaped into a long-format data frame). Note: for column annotations, the heatmap matrix will be transposed, since gganno will always regard row as the observations.

pdf(NULL)
draw(ggheat(small_mat,
  top_annotation = eheat_anno(
    foo = gganno(
      data = NULL,
      function(p) {
        print(head(p$data))
        p
      }
    )
  )
))
#>   .slice .row_names .column_names .row_index .column_index x       value
#> 1      1    column1          row1          1             1 1  0.90474160
#> 2      1    column1          row2          1             2 1  0.90882972
#> 3      1    column1          row3          1             3 1  0.28074668
#> 4      1    column1          row4          1             4 1  0.02729558
#> 5      1    column1          row5          1             5 1 -0.32552445
#> 6      1    column1          row6          1             6 1  0.58403269
dev.off()
#> png 
#>   2
pdf(NULL)
draw(ggheat(small_mat,
  left_annotation = eheat_anno(
    foo = gganno(
      data = NULL,
      function(p) {
        print(head(p$data))
        p
      }
    )
  )
))
#>   .slice .row_names .column_names .row_index .column_index y      value
#> 1      1       row1       column6          1             6 2  0.1621522
#> 2      1       row1       column9          1             9 2 -0.1629658
#> 3      1       row1       column1          1             1 2  0.9047416
#> 4      1       row1       column7          1             7 2 -0.2869867
#> 5      1       row1       column8          1             8 2  0.6803262
#> 6      1       row1       column4          1             4 2  1.2676994
dev.off()
#> png 
#>   2

You can also supply a function (purrr-lambda is also okay) in the data, which will be applied in the heatmap matrix. Note: for column annotations, the heatmap matrix will be transposed before pass into this function.

pdf(NULL)
draw(ggheat(small_mat,
  top_annotation = eheat_anno(
    foo = gganno(
      data = function(x) {
        if (identical(x, small_mat)) {
          print("matrix not transposed")
        } else if (identical(x, t(small_mat))) {
          print("matrix transposed")
        }
        rowSums(x)
      }
    ),
    which = "column"
  )
))
#> [1] "matrix transposed"
#> ℹ convert simple vector to one-column matrix
dev.off()
#> png 
#>   2
pdf(NULL)
draw(ggheat(small_mat,
  left_annotation = eheat_anno(
    foo = gganno(
      data = function(x) {
        if (identical(x, small_mat)) {
          print("matrix not transposed")
        } else if (identical(x, t(small_mat))) {
          print("matrix transposed")
        }
        rowSums(x)
      }
    )
  )
))
#> [1] "matrix not transposed"
#> ℹ convert simple vector to one-column matrix
dev.off()
#> png 
#>   2

Similarly, we can leverage the geometric objects (geoms) provided by ggplot2 in ggfn to create annotation.

anno_data <- sample(1:10, nrow(small_mat))
draw(ggheat(small_mat,
  top_annotation = eheat_anno(
    foo = gganno(
      data = anno_data,
      function(p) {
        p + geom_point(aes(x, value))
      }
    )
  )
))
#> ℹ convert simple vector to one-column matrix

Legends will also be extracted, in the similar manner like passing them into annotation_legend_list argument.

draw(ggheat(small_mat,
  top_annotation = eheat_anno(
    foo = gganno(
      data = anno_data,
      function(p) {
        p + geom_bar(aes(y = value, fill = factor(.row_index)), stat = "identity")
      }, size = unit(5, "cm")
    )
  )
), merge_legends = TRUE)
#> ℹ convert simple vector to one-column matrix

draw(ggheat(small_mat,
  top_annotation = eheat_anno(
    foo = gganno(
      data = anno_data,
      function(p) {
        p + geom_boxplot(aes(y = value, fill = factor(.slice)))
      }, size = unit(5, "cm")
    )
  ), column_km = 2L
), merge_legends = TRUE)
#> ℹ convert simple vector to one-column matrix

box_matrix1 <- matrix(rnorm(ncol(small_mat)^2L, 10), nrow = ncol(small_mat))
colnames(box_matrix1) <- rep_len("group1", ncol(small_mat))
box_matrix2 <- matrix(rnorm(ncol(small_mat)^2L, 20), nrow = ncol(small_mat))
colnames(box_matrix2) <- rep_len("group2", ncol(small_mat))
draw(ggheat(small_mat,
  top_annotation = eheat_anno(
    foo = gganno(
      data = cbind(box_matrix1, box_matrix2),
      function(p) {
        p +
          geom_violin(
            aes(
              y = value, fill = factor(.column_names),
              color = factor(.slice),
              group = paste(.slice, .row_index, .column_names, sep = "-")
            )
          ) +
          geom_boxplot(
            aes(
              y = value, fill = factor(.column_names),
              color = factor(.slice),
              group = paste(.slice, .row_index, .column_names, sep = "-")
            ),
            width = 0.2,
            position = position_dodge(width = 0.9)
          ) +
          scale_fill_brewer(
            name = "Group", type = "qual", palette = "Set3"
          ) +
          scale_color_brewer(
            name = "Slice", type = "qual", palette = "Set1"
          )
      }, size = unit(3, "cm")
    )
  ), column_km = 2L
), merge_legends = TRUE)

draw(ggheat(small_mat,
  top_annotation = eheat_anno(
    foo = gganno(
      data = anno_data,
      function(p) {
        p + aes(y = value) + geom_text(aes(label = .row_index))
      }, size = unit(2, "cm")
    )
  ),
  bottom_annotation = eheat_anno(
    foo = gganno(
      function(p) {
        p + aes(y = value) +
          geom_text(aes(label = .row_index)) +
          scale_y_reverse()
      },
      data = anno_data,
      size = unit(2, "cm")
    )
  ),
  right_annotation = eheat_anno(
    foo = gganno(
      function(p) {
        p + aes(x = value) +
          geom_text(aes(label = .row_index))
      },
      data = anno_data,
      size = unit(3, "cm")
    )
  ),
  left_annotation = eheat_anno(
    foo = gganno(
      function(p) {
        p + aes(x = value) +
          geom_text(aes(label = .row_index)) +
          scale_x_reverse()
      },
      data = anno_data,
      size = unit(3, "cm")
    )
  ),
  row_km = 2L, column_km = 2L,
), merge_legends = TRUE)
#> ℹ convert simple vector to one-column matrix
#> ℹ convert simple vector to one-column matrix
#> ℹ convert simple vector to one-column matrix
#> ℹ convert simple vector to one-column matrix

gganno can work with Heatmap function, in this way, legends won’t be extracted. In general, we should just use ggheat and gganno.

draw(ComplexHeatmap::Heatmap(small_mat,
  top_annotation = eheat_anno(
    foo = gganno(
      data = anno_data,
      function(p) {
        p + geom_bar(aes(y = value, fill = factor(.row_index)), stat = "identity")
      }
    )
  )
), merge_legends = TRUE)
#> ℹ convert simple vector to one-column matrix

anno_gg and anno_gg2

Both function acts similar with other annotation function in ComplexHeatmap. They accept a ggplot object and fit it in the ComplexHeatmap annotation area.

g <- ggplot(mpg, aes(displ, hwy, colour = class)) +
  geom_point()
m <- matrix(rnorm(100), 10)

# anno_gg-panel: clip = "off" -------
ggheat(m,
  top_annotation = eheat_anno(
    ggplot = anno_gg(g, "panel",
      clip = "off",
      size = unit(3, "cm"),
      show_name = FALSE
    )
  )
)

# anno_gg-panel: clip = "on" --------
ggheat(m,
  top_annotation = eheat_anno(
    ggplot = anno_gg(g, "panel",
      clip = "on",
      size = unit(3, "cm"),
      show_name = FALSE
    )
  )
)

# anno_gg-plot --------------------
ggheat(m,
  top_annotation = eheat_anno(
    ggplot = anno_gg(g, "plot",
      size = unit(3, "cm"),
      show_name = FALSE
    )
  )
)

# anno_gg-full --------------------
ggheat(m,
  top_annotation = eheat_anno(
    ggplot = anno_gg(g, "full",
      size = unit(3, "cm"),
      show_name = FALSE
    )
  )
)

anno_gg2 is the same with anno_gg, it differs in terms of its arguments, and allow more precise adjustment of the clip feature.

# anno_gg2-panel: margins = NULL -------
ggheat(m,
  top_annotation = eheat_anno(
    ggplot = anno_gg2(g, "panel",
      margins = NULL,
      size = unit(3, "cm"),
      show_name = FALSE
    )
  )
)

# anno_gg2-panel: margins = "l" --------
ggheat(m,
  top_annotation = eheat_anno(
    ggplot = anno_gg2(g, "panel",
      margins = "l",
      size = unit(3, "cm"),
      show_name = FALSE
    )
  )
)

# anno_gg2-panel: margins = "r" --------
ggheat(m,
  top_annotation = eheat_anno(
    ggplot = anno_gg2(g, "panel",
      margins = "r",
      size = unit(3, "cm"),
      show_name = FALSE
    )
  )
)

# anno_gg2-plot ---------------------
ggheat(m,
  top_annotation = eheat_anno(
    ggplot = anno_gg2(g, "plot",
      size = unit(3, "cm"),
      show_name = FALSE
    )
  )
)

# anno_gg2-full --------------------
ggheat(m,
  top_annotation = eheat_anno(
    ggplot = anno_gg2(
      g + guides(colour = guide_legend(
        theme = theme(
          legend.key.size = unit(1, "mm"),
          legend.text = element_text(size = 10),
          legend.key.spacing = unit(0, "mm"),
          legend.title.position = "bottom",
          legend.key = element_blank()
        ),
        ncol = 2L
      )),
      align_with = "full",
      size = unit(3, "cm"),
      show_name = FALSE
    )
  )
)

Session information

sessionInfo()
#> R version 4.4.0 (2024-04-24)
#> Platform: x86_64-pc-linux-gnu
#> Running under: Ubuntu 24.04 LTS
#> 
#> Matrix products: default
#> BLAS/LAPACK: /usr/lib/x86_64-linux-gnu/libmkl_rt.so;  LAPACK version 3.8.0
#> 
#> locale:
#>  [1] LC_CTYPE=C.UTF-8       LC_NUMERIC=C           LC_TIME=C.UTF-8       
#>  [4] LC_COLLATE=C.UTF-8     LC_MONETARY=C.UTF-8    LC_MESSAGES=C.UTF-8   
#>  [7] LC_PAPER=C.UTF-8       LC_NAME=C              LC_ADDRESS=C          
#> [10] LC_TELEPHONE=C         LC_MEASUREMENT=C.UTF-8 LC_IDENTIFICATION=C   
#> 
#> time zone: Asia/Shanghai
#> tzcode source: system (glibc)
#> 
#> attached base packages:
#> [1] stats     graphics  grDevices utils     datasets  methods   base     
#> 
#> other attached packages:
#> [1] eheat_0.99.8  ggplot2_3.5.1
#> 
#> loaded via a namespace (and not attached):
#>  [1] tidyr_1.3.1           utf8_1.2.4            generics_0.1.3       
#>  [4] shape_1.4.6.1         digest_0.6.36         magrittr_2.0.3       
#>  [7] evaluate_0.24.0       grid_4.4.0            RColorBrewer_1.1-3   
#> [10] iterators_1.0.14      circlize_0.4.16       fastmap_1.2.0        
#> [13] foreach_1.5.2         doParallel_1.0.17     GlobalOptions_0.1.2  
#> [16] ComplexHeatmap_2.20.0 purrr_1.0.2           fansi_1.0.6          
#> [19] viridisLite_0.4.2     scales_1.3.0          codetools_0.2-20     
#> [22] cli_3.6.3             rlang_1.1.4           crayon_1.5.3         
#> [25] munsell_0.5.1         withr_3.0.0           yaml_2.3.8           
#> [28] ggh4x_0.2.8           tools_4.4.0           parallel_4.4.0       
#> [31] dplyr_1.1.4           colorspace_2.1-0      GetoptLong_1.0.5     
#> [34] BiocGenerics_0.50.0   vctrs_0.6.5           R6_2.5.1             
#> [37] png_0.1-8             magick_2.8.3          matrixStats_1.3.0    
#> [40] stats4_4.4.0          lifecycle_1.0.4       S4Vectors_0.42.0     
#> [43] IRanges_2.38.0        clue_0.3-65           cluster_2.1.6        
#> [46] pkgconfig_2.0.3       pillar_1.9.0          gtable_0.3.5         
#> [49] Rcpp_1.0.12           glue_1.7.0            highr_0.11           
#> [52] xfun_0.45             tibble_3.2.1          tidyselect_1.2.1     
#> [55] knitr_1.47            farver_2.1.2          rjson_0.2.21         
#> [58] htmltools_0.5.8.1     labeling_0.4.3        rmarkdown_2.27       
#> [61] Cairo_1.6-2           compiler_4.4.0

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