You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: example_linalg_test.go
    path of file: ./repos/gorgonia
    
    the code of the file until where you have to start completion: package gorgonia

import (
	"fmt"
	"log"
	"
    
func ExampleBatchedMatMul_withBackprop() {
	g := NewGraph()
	a := NewTensor(g, Float64, 4, WithShape(2, 4, 3, 9), WithInit(RangedFrom(1)), WithName("a"))
	b := NewTensor(g, Float64, 4, WithShape(2, 4, 3, 9), WithInit(RangedFrom(13)), WithName("b"))
	c, err := BatchedMatMul(a, b, false, true)
	if err != nil {
		log.Fatal(err)
	}
	s, err := Sum(c)
	if err != nil {
		log.Fatal(err)
	}
	grads, err := Grad(s, a, b)
	if err != nil {
		log.Fatal(err)
	}

	m := NewTapeMachine(g)
	if err := m.RunAll(); err != nil {
		log.Fatal(err)
	}

	fmt.Printf("a: %v\n%v\n", a.Value().Shape(), a.Value().Data())
	fmt.Printf("b: %v\n%v\n", b.Value().Shape(), b.Value().Data())
	fmt.Printf("c: %v\n%v\n", c.Value().Shape(), c.Value().Data())
	fmt.Printf("grads[0]:%v\n%v\n", grads[0].Shape(), grads[0].Value().Data())
	// Output:
	// a: (2, 4, 3, 9)
	// [1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216]
	// b: (2, 4, 3, 9)
	// [13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228]
	// c: (2, 4, 3, 3)
	// [825 1230 1635 2202 3336 4470 3579 5442 7305 12732 15324 17916 16296 19617 22938 19860 23910 27960 37761 42540 47319 43512 49020 54528 49263 55500 61737 75912 82878 89844 83850 91545 99240 91788 100212 108636 127185 136338 145491 137310 147192 157074 147435 158046 168657 191580 202920 214260 203892 215961 228030 216204 229002 241800 269097 282624 296151 283596 297852 312108 298095 313080 328065 359736 375450 391164 376422 392865 409308 393108 410280 427452]
	// grads[0]:(2, 4, 3, 9)
	// [66 69 72 75 78 81 84 87 90 66 69 72 75 78 81 84 87 90 66 69 72 75 78 81 84 87 90 147 150 153 156 159 162 165 168 171 147 150 153 156 159 162 165 168 171 147 150 153 156 159 162 165 168 171 228 231 234 237 240 243 246 249 252 228 231 234 237 240 243 246 249 252 228 231 234 237 240 243 246 249 252 309 312 315 318 321 324 327 330 333 309 312 315 318 321 324 327 330 333 309 312 315 318 321 324 327 330 333 390 393 396 399 402 405 408 411 414 390 393 396 399 402 405 408 411 414 390 393 396 399 402 405 408 411 414 471 474 477 480 483 486 489 492 495 471 474 477 480 483 486 489 492 495 471 474 477 480 483 486 489 492 495 552 555 558 561 564 567 570 573 576 552 555 558 561 564 567 570 573 576 552 555 558 561 564 567 570 573 576 633 636 639 642 645 648 651 654 657 633 636 639 642 645 648 651 654 657 633 636 639 642 645 648 651 654 657]
}