keras ¿¹Á¦¿¡¼ numpy ¶óÀ̺귯¸®¸¦ ¸¹ÀÌ »ç¿ëÇÏ°í ÀÖ´Ù. ¶óÀ̺귯¸®ÀÇ »ç¿ë¹ý¿¡ ´ëÇؼ ¾Ë¾Æº¸°í ³Ñ¾î°£´Ù. numpy ÀÓÆ÷Æ®´Â ´ÙÀ½°ú °°ÀÌ ÇÑ´Ù. import numpy as np ¹öÀü Ç¥½Ã import numpy as np
print('numpy ' + np.__version__) ½ÇÇà °á°ú) numpy 1.14.5 numpy¿¡¼ Shape¶õ?numpyÀÇ ¹è¿ ±¸Á¶´Â 'shape'·Î Ç¥ÇöÇÑ´Ù. ¹è¿ÀÇ ±¸Á¶¸¦ ÆÄÀ̽ã Æ©Çà ÀÚ·áÇüÀ» ÀÌ¿ëÇÏ¿© Á¤ÀÇÇÑ´Ù.import numpy as np
data = np.array([1, 2, 3]) print(data.shape) ½ÇÇà °á°ú) (3,) import numpy as np
data = np.array([(1,2,3), (4,5,6)], dtype = float) print(data.shape) ½ÇÇà °á°ú) (2, 3) import numpy as np
# 1, 2 # 3, 4 # 5, 6 #a = np.array([[1,2], [3,4,], [6,6]]) À̰͵µ µÈ´Ù a = np.array([(1,2), (3,4,), (6,6)]) print(a.shape); ½ÇÇà °á°ú) (3, 2) °¡·Î 128, ¼¼·Î 128, RGB °ªÀ» °¡Áö´Â À̹ÌÁöÀÇ 3Â÷¿ø ¹è¿ Á¤ÀÇ´Â ´ÙÀ½°ú °°ÀÌ ÇÑ´Ù. data = np.zeros((10, 10, 3), dtype=np.uint8)
print(data.shape) ½ÇÇà °á°ú) (10, 10, 3) ¹è¿ Àε¦½Ì¹è¿¿¡¼ ƯÁ¤ À妽º ¿µ¿ª¸¸ ÀÐ¾î ¿À´Â°ÍÀ» ½½¶óÀ̽ÌÀ̶ó ÇÑ´Ù.Ç¥ÇöÀº ¹è¿À̸§[ Çà, ¿ ]·Î ù¹ø° ÆĶó¸ÞÅÍ°¡ ÇàÀ̶ó´Â°ÍÀ» ±î¸ÔÁö ¸»ÀÚ. ¿µ¿ªÀº ÄÝ·ÐÀ¸·Î ½ÃÀÛ À妽º¿Í ¸¶Áö¸· À妽º¸¦ ÁöÁ¤ÇÑ´Ù. ¸¶Áö¸· À妽º´Â Æ÷ÇÔÇÏÁö ¾Ê´Â´Ù. ½ÃÀÛ À妽º : ¸¶Áö¸· À妽º a = data[:2, 1:3] ":2" ó·³ Ç¥Çö Çϸé 0ºÎÅÍ 2¹ø° À妽º ±îÁö(2¹ø° À妽º´Â Æ÷ÇÔ ¾ÈÇÔ)¸¦ ³ªÅ¸³½´Ù. ":" ó·³ Ç¥Çö Çϸé Àüü¸¦ ³ªÅ¸ ³½´Ù. ƯÁ¤ À妽º¸¸ ÁöÁ¤ÇÏ°í ½Í´Ù¸é ÄÝ·ÐÀ» »ç¿ëÇÏÁö ¾Ê°í À妽º¸¸ ÁöÁ¤ÇÑ´Ù. b = data[:, 2] À§ÀÇ Ç¥ÇöÀº ÇàÀº Àüü ¿Àº 2¹ø° À妽º¸¸ ÁöÁ¤ÇÑ °ÍÀÌ´Ù. import numpy as np
# 1, 2, 3, 4 # 5, 6, 7, 8 # 9, 10, 11, 12 data = np.array([(1,2,3,4), (5,6,7,8), (9,10,11,12)]) a = data[:2, 1:3] b = data[:, 2] print('shape ' , data.shape) print('a data =================') print(a) print('b data =================') print(b) ½ÇÇà °á°ú) shape (3, 4) a data ================= [[2 3] [6 7]] b data ================= [ 3 7 11] import numpy as np
a = np.array([1,1,1,1,1]) b = np.array([2,3,4,5,6]) # sqrt( 1/n ¥Ò(b-a)**2 ) # np.sqrt(((b-a)**2).mean()) data = ((b-a)**2).mean() datasqrt = np.sqrt(data) print('data mean :', data) print('data sqrt :', datasqrt) ½ÇÇà °á°ú) data mean : 11.0 data sqrt : 3.3166247903554 ºÒ¸®¾ð ¹è¿ Àε¦½ÌºÒ¸®¾ð ¹è¿À» ¸¸µé¾î¼ ƯÁ¤ Á¶°Ç¿¡ ÇØ´çÇÏ´Â ¹è¿ À妽º¸¸ ¼±Åà ÇÒ ¼ö ÀÖ´Ù.¾Æ·¡´Â 5º¸´Ù Å«¼ö¸¸ ÁöÁ¤ÇÏ¿© Ãâ·ÂÇÑ´Ù. import numpy as np
data = np.array([(1,2,3,4), (5,6,7,8), (9,10,11,12)]) bool_idx = (data > 5) print(data[bool_idx]) print(bool_idx) ½ÇÇà °á°ú) [ 6 7 8 9 10 11 12] [[False False False False] [False True True True] [ True True True True]] ¹è¿ ¿¬»ê¹è¿ ¿¬»êÀÇ ¸î°¡Áö ¿¹Á¦´Â ´ÙÀ½°ú °°´Ù.import numpy as np
a = np.array([1,2,3]) b = np.array([10,20,30]) print('a+b: ', a + b) # np.add(a, b) print('a-b:', a - b) # np.subtract(a, b) print('a*b', a * b) # np.multiply(a, b) print('a / b:', a / b) # np.divide(a, b) print('mean:', np.mean(b)) print('mean1', b.mean()) print('sqrt:', np.sqrt(a)) print('sum:', np.sum(b)) ½ÇÇà °á°ú) a+b: [11 22 33] a-b: [ -9 -18 -27] a*b [10 40 90] a / b: [0.1 0.1 0.1] mean: 20.0 mean1 20.0 sqrt: [1. 1.41421356 1.73205081] sum: 60 Æò±Õ Á¦°ö±Ù ¿ÀÂ÷(Root Mean Square Error; RMSE)¸¦ ÆÄÀ̽ãÀ¸·Î Ç¥Çö ÇÏ¸é ´ÙÀ½°ú °°´Ù. p: ¿¹Ãø°ª
|