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add test for Conv2D gradients #443

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Aug 19, 2019
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add test for Conv2D gradients #443

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f311f29
add testConv2dGradient
mikowals Aug 13, 2019
a633dde
Merge branch 'master' of https://github.com/tensorflow/swift-apis int…
mikowals Aug 19, 2019
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47 changes: 47 additions & 0 deletions Tests/TensorFlowTests/LayerTests.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -110,6 +110,52 @@ final class LayerTests: XCTestCase {
XCTAssertEqual(output, expected)
}

func testConv2DGradient() {
let filter = Tensor(shape: [3, 3, 2, 4], scalars: (0..<72).map(Float.init))
let bias = Tensor<Float>(zeros: [4])
let layer = Conv2D<Float>(filter: filter,
bias: bias,
activation: identity,
strides: (2, 2),
padding: .valid)
let input = Tensor(shape: [2, 4, 4, 2], scalars: (0..<64).map(Float.init))
let grads = gradient( at: input, layer) { $1($0).sum() }
// The expected gradients were computed using the following Python code:
// ```
// x = tf.reshape(tf.range(64, dtype=tf.float32), [2, 4, 4, 2])
// filter = tf.reshape(tf.range(72, dtype=tf.float32), [3, 3, 2, 4])
// bias = tf.zeros([4])
// with tf.GradientTape() as t:
// t.watch([x, filter, bias])
// y = tf.math.reduce_sum(tf.nn.conv2d(input=x,
// filters=filter,
// strides=[1, 2, 2, 1],
// data_format="NHWC",
// padding="VALID") + bias)
// grads = t.gradient(y, [x, filter, bias])
// ```
XCTAssertEqual(grads.0,
[[[[ 6, 22], [ 38, 54], [ 70, 86], [ 0, 0]],
[[102, 118], [134, 150], [166, 182], [ 0, 0]],
[[198, 214], [230, 246], [262, 278], [ 0, 0]],
[[ 0, 0], [ 0, 0], [ 0, 0], [ 0, 0]]],
[[[ 6, 22], [ 38, 54], [ 70, 86], [ 0, 0]],
[[102, 118], [134, 150], [166, 182], [ 0, 0]],
[[198, 214], [230, 246], [262, 278], [ 0, 0]],
[[ 0, 0], [ 0, 0], [ 0, 0], [ 0, 0]]]])
XCTAssertEqual(grads.1.filter,
[[[[32, 32, 32, 32], [34, 34, 34, 34]],
[[36, 36, 36, 36], [38, 38, 38, 38]],
[[40, 40, 40, 40], [42, 42, 42, 42]]],
[[[48, 48, 48, 48], [50, 50, 50, 50]],
[[52, 52, 52, 52], [54, 54, 54, 54]],
[[56, 56, 56, 56], [58, 58, 58, 58]]],
[[[64, 64, 64, 64], [66, 66, 66, 66]],
[[68, 68, 68, 68], [70, 70, 70, 70]],
[[72, 72, 72, 72], [74, 74, 74, 74]]]])
XCTAssertEqual(grads.1.bias, [2, 2, 2, 2])
}

func testConv2DDilation() {
// Input shapes. (Data format = NHWC)
let batchSize = 2
Expand Down Expand Up @@ -697,6 +743,7 @@ final class LayerTests: XCTestCase {
("testConv1D", testConv1D),
("testConv1DDilation", testConv1DDilation),
("testConv2D", testConv2D),
("testConv2DGradient", testConv2DGradient),
("testConv2DDilation", testConv2DDilation),
("testConv3D", testConv3D),
("testDepthConv2D", testDepthConv2D),
Expand Down